Home / 640,852,403.40-961,278,605.10-398,987,699.40

Finding the Fourth Proportional to 640,852,403.40, 961,278,605.10 and 398,987,699.40

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Solution

The fourth proportional to 640,852,403.40, 961,278,605.10 and 398,987,699.40 is: 598,481,549.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,852,403.40 : 961,278,605.10 = 398,987,699.40 : x
  2. Step 2: Convert to fraction form
    640,852,403.40/961,278,605.10 = 398,987,699.40/x
  3. Step 3: Cross multiply
    640,852,403.40x = 961,278,605.10 × 398,987,699.40
  4. Step 4: Simplify right side
    640,852,403.40x = 383,538,339,131,290,112
  5. Step 5: Solve for x
    x = 383,538,339,131,290,112/640,852,403.40
  6. Step 6: Final answer
    x = 598,481,549.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.