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Finding the Fourth Proportional to 178.62, 246.45 and 129.57

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Solution

The fourth proportional to 178.62, 246.45 and 129.57 is: 178.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.62 : 246.45 = 129.57 : x
  2. Step 2: Convert to fraction form
    178.62/246.45 = 129.57/x
  3. Step 3: Cross multiply
    178.62x = 246.45 × 129.57
  4. Step 4: Simplify right side
    178.62x = 31,932.53
  5. Step 5: Solve for x
    x = 31,932.53/178.62
  6. Step 6: Final answer
    x = 178.77

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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.