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Finding the Fourth Proportional to 981.24, 1,354.05 and 539.13

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Solution

The fourth proportional to 981.24, 1,354.05 and 539.13 is: 743.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.24 : 1,354.05 = 539.13 : x
  2. Step 2: Convert to fraction form
    981.24/1,354.05 = 539.13/x
  3. Step 3: Cross multiply
    981.24x = 1,354.05 × 539.13
  4. Step 4: Simplify right side
    981.24x = 730,008.98
  5. Step 5: Solve for x
    x = 730,008.98/981.24
  6. Step 6: Final answer
    x = 743.97

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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.