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Finding the Fourth Proportional to 981.49, 1,354.50 and 539.38

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Solution

The fourth proportional to 981.49, 1,354.50 and 539.38 is: 744.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.49 : 1,354.50 = 539.38 : x
  2. Step 2: Convert to fraction form
    981.49/1,354.50 = 539.38/x
  3. Step 3: Cross multiply
    981.49x = 1,354.50 × 539.38
  4. Step 4: Simplify right side
    981.49x = 730,594.20
  5. Step 5: Solve for x
    x = 730,594.20/981.49
  6. Step 6: Final answer
    x = 744.37

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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.