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Finding the Fourth Proportional to 101.18, 140.20 and 99.87

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Solution

The fourth proportional to 101.18, 140.20 and 99.87 is: 138.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.18 : 140.20 = 99.87 : x
  2. Step 2: Convert to fraction form
    101.18/140.20 = 99.87/x
  3. Step 3: Cross multiply
    101.18x = 140.20 × 99.87
  4. Step 4: Simplify right side
    101.18x = 14,001.00
  5. Step 5: Solve for x
    x = 14,001.00/101.18
  6. Step 6: Final answer
    x = 138.37

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.