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Finding the Fourth Proportional to 129.90, 179.29 and 88.43

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Solution

The fourth proportional to 129.90, 179.29 and 88.43 is: 122.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.90 : 179.29 = 88.43 : x
  2. Step 2: Convert to fraction form
    129.90/179.29 = 88.43/x
  3. Step 3: Cross multiply
    129.90x = 179.29 × 88.43
  4. Step 4: Simplify right side
    129.90x = 15,854.84
  5. Step 5: Solve for x
    x = 15,854.84/129.90
  6. Step 6: Final answer
    x = 122.05

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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.