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Finding the Fourth Proportional to 140.22, 193.53 and 87.79

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Solution

The fourth proportional to 140.22, 193.53 and 87.79 is: 121.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.22 : 193.53 = 87.79 : x
  2. Step 2: Convert to fraction form
    140.22/193.53 = 87.79/x
  3. Step 3: Cross multiply
    140.22x = 193.53 × 87.79
  4. Step 4: Simplify right side
    140.22x = 16,988.59
  5. Step 5: Solve for x
    x = 16,988.59/140.22
  6. Step 6: Final answer
    x = 121.16

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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.