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Finding the Fourth Proportional to 178.38, 245.52 and 129.15

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Solution

The fourth proportional to 178.38, 245.52 and 129.15 is: 177.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.38 : 245.52 = 129.15 : x
  2. Step 2: Convert to fraction form
    178.38/245.52 = 129.15/x
  3. Step 3: Cross multiply
    178.38x = 245.52 × 129.15
  4. Step 4: Simplify right side
    178.38x = 31,708.91
  5. Step 5: Solve for x
    x = 31,708.91/178.38
  6. Step 6: Final answer
    x = 177.76

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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.