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Finding the Fourth Proportional to 106.13, 158.85 and 86.65

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Solution

The fourth proportional to 106.13, 158.85 and 86.65 is: 129.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.13 : 158.85 = 86.65 : x
  2. Step 2: Convert to fraction form
    106.13/158.85 = 86.65/x
  3. Step 3: Cross multiply
    106.13x = 158.85 × 86.65
  4. Step 4: Simplify right side
    106.13x = 13,763.96
  5. Step 5: Solve for x
    x = 13,763.96/106.13
  6. Step 6: Final answer
    x = 129.69

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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.