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Finding the Fourth Proportional to 140.47, 193.91 and 91.43

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Solution

The fourth proportional to 140.47, 193.91 and 91.43 is: 126.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.47 : 193.91 = 91.43 : x
  2. Step 2: Convert to fraction form
    140.47/193.91 = 91.43/x
  3. Step 3: Cross multiply
    140.47x = 193.91 × 91.43
  4. Step 4: Simplify right side
    140.47x = 17,727.76
  5. Step 5: Solve for x
    x = 17,727.76/140.47
  6. Step 6: Final answer
    x = 126.21

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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.