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Finding the Fourth Proportional to 129.80, 179.15 and 88.37

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Solution

The fourth proportional to 129.80, 179.15 and 88.37 is: 121.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.80 : 179.15 = 88.37 : x
  2. Step 2: Convert to fraction form
    129.80/179.15 = 88.37/x
  3. Step 3: Cross multiply
    129.80x = 179.15 × 88.37
  4. Step 4: Simplify right side
    129.80x = 15,830.48
  5. Step 5: Solve for x
    x = 15,830.48/129.80
  6. Step 6: Final answer
    x = 121.97

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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.