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Finding the Fourth Proportional to 981.66, 1,354.71 and 539.55

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Solution

The fourth proportional to 981.66, 1,354.71 and 539.55 is: 744.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.66 : 1,354.71 = 539.55 : x
  2. Step 2: Convert to fraction form
    981.66/1,354.71 = 539.55/x
  3. Step 3: Cross multiply
    981.66x = 1,354.71 × 539.55
  4. Step 4: Simplify right side
    981.66x = 730,933.78
  5. Step 5: Solve for x
    x = 730,933.78/981.66
  6. Step 6: Final answer
    x = 744.59

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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.