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Finding the Fourth Proportional to 118.10, 176.31 and 99.87

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Solution

The fourth proportional to 118.10, 176.31 and 99.87 is: 149.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.10 : 176.31 = 99.87 : x
  2. Step 2: Convert to fraction form
    118.10/176.31 = 99.87/x
  3. Step 3: Cross multiply
    118.10x = 176.31 × 99.87
  4. Step 4: Simplify right side
    118.10x = 17,607.83
  5. Step 5: Solve for x
    x = 17,607.83/118.10
  6. Step 6: Final answer
    x = 149.09

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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.