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Finding the Fourth Proportional to 494.50, 741.76 and 129.30

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Solution

The fourth proportional to 494.50, 741.76 and 129.30 is: 193.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.50 : 741.76 = 129.30 : x
  2. Step 2: Convert to fraction form
    494.50/741.76 = 129.30/x
  3. Step 3: Cross multiply
    494.50x = 741.76 × 129.30
  4. Step 4: Simplify right side
    494.50x = 95,909.57
  5. Step 5: Solve for x
    x = 95,909.57/494.50
  6. Step 6: Final answer
    x = 193.95

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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.