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Finding the Fourth Proportional to 129.37, 178.47 and 87.95

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Solution

The fourth proportional to 129.37, 178.47 and 87.95 is: 121.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.37 : 178.47 = 87.95 : x
  2. Step 2: Convert to fraction form
    129.37/178.47 = 87.95/x
  3. Step 3: Cross multiply
    129.37x = 178.47 × 87.95
  4. Step 4: Simplify right side
    129.37x = 15,696.44
  5. Step 5: Solve for x
    x = 15,696.44/129.37
  6. Step 6: Final answer
    x = 121.33

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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.