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Finding the Fourth Proportional to 106.13, 159.03 and 87.91

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Solution

The fourth proportional to 106.13, 159.03 and 87.91 is: 131.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.13 : 159.03 = 87.91 : x
  2. Step 2: Convert to fraction form
    106.13/159.03 = 87.91/x
  3. Step 3: Cross multiply
    106.13x = 159.03 × 87.91
  4. Step 4: Simplify right side
    106.13x = 13,979.93
  5. Step 5: Solve for x
    x = 13,979.93/106.13
  6. Step 6: Final answer
    x = 131.72

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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.