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Finding the Fourth Proportional to 86.85, 130.15 and 67.61

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Solution

The fourth proportional to 86.85, 130.15 and 67.61 is: 101.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.85 : 130.15 = 67.61 : x
  2. Step 2: Convert to fraction form
    86.85/130.15 = 67.61/x
  3. Step 3: Cross multiply
    86.85x = 130.15 × 67.61
  4. Step 4: Simplify right side
    86.85x = 8,799.44
  5. Step 5: Solve for x
    x = 8,799.44/86.85
  6. Step 6: Final answer
    x = 101.32

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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.