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Finding the Fourth Proportional to 981.42, 1,354.39 and 539.35

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Solution

The fourth proportional to 981.42, 1,354.39 and 539.35 is: 744.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.42 : 1,354.39 = 539.35 : x
  2. Step 2: Convert to fraction form
    981.42/1,354.39 = 539.35/x
  3. Step 3: Cross multiply
    981.42x = 1,354.39 × 539.35
  4. Step 4: Simplify right side
    981.42x = 730,487.55
  5. Step 5: Solve for x
    x = 730,487.55/981.42
  6. Step 6: Final answer
    x = 744.32

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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.