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Finding the Fourth Proportional to 113.87, 170.49 and 86.69

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Solution

The fourth proportional to 113.87, 170.49 and 86.69 is: 129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.87 : 170.49 = 86.69 : x
  2. Step 2: Convert to fraction form
    113.87/170.49 = 86.69/x
  3. Step 3: Cross multiply
    113.87x = 170.49 × 86.69
  4. Step 4: Simplify right side
    113.87x = 14,780.53
  5. Step 5: Solve for x
    x = 14,780.53/113.87
  6. Step 6: Final answer
    x = 129.80

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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.