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Finding the Fourth Proportional to 106.81, 159.44 and 86.29

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Solution

The fourth proportional to 106.81, 159.44 and 86.29 is: 128.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.81 : 159.44 = 86.29 : x
  2. Step 2: Convert to fraction form
    106.81/159.44 = 86.29/x
  3. Step 3: Cross multiply
    106.81x = 159.44 × 86.29
  4. Step 4: Simplify right side
    106.81x = 13,758.08
  5. Step 5: Solve for x
    x = 13,758.08/106.81
  6. Step 6: Final answer
    x = 128.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.