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Finding the Fourth Proportional to 680,021.32, 938,371.53 and 393,559.12

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Solution

The fourth proportional to 680,021.32, 938,371.53 and 393,559.12 is: 543,078.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,021.32 : 938,371.53 = 393,559.12 : x
  2. Step 2: Convert to fraction form
    680,021.32/938,371.53 = 393,559.12/x
  3. Step 3: Cross multiply
    680,021.32x = 938,371.53 × 393,559.12
  4. Step 4: Simplify right side
    680,021.32x = 369,304,673,579.85
  5. Step 5: Solve for x
    x = 369,304,673,579.85/680,021.32
  6. Step 6: Final answer
    x = 543,078.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.