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Finding the Fourth Proportional to 178.72, 246.80 and 129.68

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Solution

The fourth proportional to 178.72, 246.80 and 129.68 is: 179.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.72 : 246.80 = 129.68 : x
  2. Step 2: Convert to fraction form
    178.72/246.80 = 129.68/x
  3. Step 3: Cross multiply
    178.72x = 246.80 × 129.68
  4. Step 4: Simplify right side
    178.72x = 32,005.02
  5. Step 5: Solve for x
    x = 32,005.02/178.72
  6. Step 6: Final answer
    x = 179.08

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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.