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Finding the Fourth Proportional to 129.74, 178.98 and 88.32

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Solution

The fourth proportional to 129.74, 178.98 and 88.32 is: 121.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.74 : 178.98 = 88.32 : x
  2. Step 2: Convert to fraction form
    129.74/178.98 = 88.32/x
  3. Step 3: Cross multiply
    129.74x = 178.98 × 88.32
  4. Step 4: Simplify right side
    129.74x = 15,807.85
  5. Step 5: Solve for x
    x = 15,807.85/129.74
  6. Step 6: Final answer
    x = 121.85

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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.