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Finding the Fourth Proportional to 129.72, 178.86 and 92.88

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Solution

The fourth proportional to 129.72, 178.86 and 92.88 is: 128.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.72 : 178.86 = 92.88 : x
  2. Step 2: Convert to fraction form
    129.72/178.86 = 92.88/x
  3. Step 3: Cross multiply
    129.72x = 178.86 × 92.88
  4. Step 4: Simplify right side
    129.72x = 16,612.52
  5. Step 5: Solve for x
    x = 16,612.52/129.72
  6. Step 6: Final answer
    x = 128.06

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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.