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Finding the Fourth Proportional to 938.13, 1,294.45 and 539.72

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Solution

The fourth proportional to 938.13, 1,294.45 and 539.72 is: 744.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.13 : 1,294.45 = 539.72 : x
  2. Step 2: Convert to fraction form
    938.13/1,294.45 = 539.72/x
  3. Step 3: Cross multiply
    938.13x = 1,294.45 × 539.72
  4. Step 4: Simplify right side
    938.13x = 698,640.55
  5. Step 5: Solve for x
    x = 698,640.55/938.13
  6. Step 6: Final answer
    x = 744.72

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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.