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Finding the Fourth Proportional to 100.85, 140.14 and 99.55

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Solution

The fourth proportional to 100.85, 140.14 and 99.55 is: 138.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.85 : 140.14 = 99.55 : x
  2. Step 2: Convert to fraction form
    100.85/140.14 = 99.55/x
  3. Step 3: Cross multiply
    100.85x = 140.14 × 99.55
  4. Step 4: Simplify right side
    100.85x = 13,951.77
  5. Step 5: Solve for x
    x = 13,951.77/100.85
  6. Step 6: Final answer
    x = 138.35

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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.