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Finding the Fourth Proportional to 494.96, 742.42 and 129.75

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Solution

The fourth proportional to 494.96, 742.42 and 129.75 is: 194.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.96 : 742.42 = 129.75 : x
  2. Step 2: Convert to fraction form
    494.96/742.42 = 129.75/x
  3. Step 3: Cross multiply
    494.96x = 742.42 × 129.75
  4. Step 4: Simplify right side
    494.96x = 96,330.71
  5. Step 5: Solve for x
    x = 96,330.71/494.96
  6. Step 6: Final answer
    x = 194.62

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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.