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Finding the Fourth Proportional to 640,839.40, 961,259.10 and 640,839.40

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Solution

The fourth proportional to 640,839.40, 961,259.10 and 640,839.40 is: 961,259.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,839.40 : 961,259.10 = 640,839.40 : x
  2. Step 2: Convert to fraction form
    640,839.40/961,259.10 = 640,839.40/x
  3. Step 3: Cross multiply
    640,839.40x = 961,259.10 × 640,839.40
  4. Step 4: Simplify right side
    640,839.40x = 616,012,704,888.54
  5. Step 5: Solve for x
    x = 616,012,704,888.54/640,839.40
  6. Step 6: Final answer
    x = 961,259.10

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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.