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Finding the Fourth Proportional to 494.95, 742.38 and 129.72

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Solution

The fourth proportional to 494.95, 742.38 and 129.72 is: 194.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.95 : 742.38 = 129.72 : x
  2. Step 2: Convert to fraction form
    494.95/742.38 = 129.72/x
  3. Step 3: Cross multiply
    494.95x = 742.38 × 129.72
  4. Step 4: Simplify right side
    494.95x = 96,301.53
  5. Step 5: Solve for x
    x = 96,301.53/494.95
  6. Step 6: Final answer
    x = 194.57

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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.