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Finding the Fourth Proportional to 718,691.53, 991,806.23 and 392,004.65

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Solution

The fourth proportional to 718,691.53, 991,806.23 and 392,004.65 is: 540,972.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,691.53 : 991,806.23 = 392,004.65 : x
  2. Step 2: Convert to fraction form
    718,691.53/991,806.23 = 392,004.65/x
  3. Step 3: Cross multiply
    718,691.53x = 991,806.23 × 392,004.65
  4. Step 4: Simplify right side
    718,691.53x = 388,792,654,058.97
  5. Step 5: Solve for x
    x = 388,792,654,058.97/718,691.53
  6. Step 6: Final answer
    x = 540,972.92

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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.