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Finding the Fourth Proportional to 95.60, 143.10 and 86.72

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Solution

The fourth proportional to 95.60, 143.10 and 86.72 is: 129.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.60 : 143.10 = 86.72 : x
  2. Step 2: Convert to fraction form
    95.60/143.10 = 86.72/x
  3. Step 3: Cross multiply
    95.60x = 143.10 × 86.72
  4. Step 4: Simplify right side
    95.60x = 12,409.63
  5. Step 5: Solve for x
    x = 12,409.63/95.60
  6. Step 6: Final answer
    x = 129.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.