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Finding the Fourth Proportional to 106.75, 159.40 and 99.87

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Solution

The fourth proportional to 106.75, 159.40 and 99.87 is: 149.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.75 : 159.40 = 99.87 : x
  2. Step 2: Convert to fraction form
    106.75/159.40 = 99.87/x
  3. Step 3: Cross multiply
    106.75x = 159.40 × 99.87
  4. Step 4: Simplify right side
    106.75x = 15,919.28
  5. Step 5: Solve for x
    x = 15,919.28/106.75
  6. Step 6: Final answer
    x = 149.13

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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.