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Finding the Fourth Proportional to 106.66, 159.72 and 86.28

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Solution

The fourth proportional to 106.66, 159.72 and 86.28 is: 129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.66 : 159.72 = 86.28 : x
  2. Step 2: Convert to fraction form
    106.66/159.72 = 86.28/x
  3. Step 3: Cross multiply
    106.66x = 159.72 × 86.28
  4. Step 4: Simplify right side
    106.66x = 13,780.64
  5. Step 5: Solve for x
    x = 13,780.64/106.66
  6. Step 6: Final answer
    x = 129.20

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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.