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Finding the Fourth Proportional to 129.89, 179.23 and 71.68

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Solution

The fourth proportional to 129.89, 179.23 and 71.68 is: 98.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.89 : 179.23 = 71.68 : x
  2. Step 2: Convert to fraction form
    129.89/179.23 = 71.68/x
  3. Step 3: Cross multiply
    129.89x = 179.23 × 71.68
  4. Step 4: Simplify right side
    129.89x = 12,846.31
  5. Step 5: Solve for x
    x = 12,846.31/129.89
  6. Step 6: Final answer
    x = 98.90

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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.