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Finding the Fourth Proportional to 494.39, 741.61 and 129.18

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Solution

The fourth proportional to 494.39, 741.61 and 129.18 is: 193.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.39 : 741.61 = 129.18 : x
  2. Step 2: Convert to fraction form
    494.39/741.61 = 129.18/x
  3. Step 3: Cross multiply
    494.39x = 741.61 × 129.18
  4. Step 4: Simplify right side
    494.39x = 95,800.86
  5. Step 5: Solve for x
    x = 95,800.86/494.39
  6. Step 6: Final answer
    x = 193.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.