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Finding the Fourth Proportional to 129.75, 179.06 and 71.54

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Solution

The fourth proportional to 129.75, 179.06 and 71.54 is: 98.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.75 : 179.06 = 71.54 : x
  2. Step 2: Convert to fraction form
    129.75/179.06 = 71.54/x
  3. Step 3: Cross multiply
    129.75x = 179.06 × 71.54
  4. Step 4: Simplify right side
    129.75x = 12,808.70
  5. Step 5: Solve for x
    x = 12,808.70/129.75
  6. Step 6: Final answer
    x = 98.72

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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.