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Finding the Fourth Proportional to 140.67, 193.89 and 99.15

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Solution

The fourth proportional to 140.67, 193.89 and 99.15 is: 136.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.67 : 193.89 = 99.15 : x
  2. Step 2: Convert to fraction form
    140.67/193.89 = 99.15/x
  3. Step 3: Cross multiply
    140.67x = 193.89 × 99.15
  4. Step 4: Simplify right side
    140.67x = 19,224.19
  5. Step 5: Solve for x
    x = 19,224.19/140.67
  6. Step 6: Final answer
    x = 136.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.