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Finding the Fourth Proportional to 129.95, 179.32 and 71.72

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Solution

The fourth proportional to 129.95, 179.32 and 71.72 is: 98.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.95 : 179.32 = 71.72 : x
  2. Step 2: Convert to fraction form
    129.95/179.32 = 71.72/x
  3. Step 3: Cross multiply
    129.95x = 179.32 × 71.72
  4. Step 4: Simplify right side
    129.95x = 12,859.75
  5. Step 5: Solve for x
    x = 12,859.75/129.95
  6. Step 6: Final answer
    x = 98.96

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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.