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Finding the Fourth Proportional to 140.20, 193.50 and 91.21

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Solution

The fourth proportional to 140.20, 193.50 and 91.21 is: 125.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.20 : 193.50 = 91.21 : x
  2. Step 2: Convert to fraction form
    140.20/193.50 = 91.21/x
  3. Step 3: Cross multiply
    140.20x = 193.50 × 91.21
  4. Step 4: Simplify right side
    140.20x = 17,649.14
  5. Step 5: Solve for x
    x = 17,649.14/140.20
  6. Step 6: Final answer
    x = 125.89

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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.