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Finding the Fourth Proportional to 981.38, 1,354.39 and 539.33

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Solution

The fourth proportional to 981.38, 1,354.39 and 539.33 is: 744.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.38 : 1,354.39 = 539.33 : x
  2. Step 2: Convert to fraction form
    981.38/1,354.39 = 539.33/x
  3. Step 3: Cross multiply
    981.38x = 1,354.39 × 539.33
  4. Step 4: Simplify right side
    981.38x = 730,455.04
  5. Step 5: Solve for x
    x = 730,455.04/981.38
  6. Step 6: Final answer
    x = 744.31

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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.