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Finding the Fourth Proportional to 178.64, 246.74 and 129.44

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Solution

The fourth proportional to 178.64, 246.74 and 129.44 is: 178.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.64 : 246.74 = 129.44 : x
  2. Step 2: Convert to fraction form
    178.64/246.74 = 129.44/x
  3. Step 3: Cross multiply
    178.64x = 246.74 × 129.44
  4. Step 4: Simplify right side
    178.64x = 31,938.03
  5. Step 5: Solve for x
    x = 31,938.03/178.64
  6. Step 6: Final answer
    x = 178.78

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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.