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Finding the Fourth Proportional to 140.02, 193.21 and 87.48

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Solution

The fourth proportional to 140.02, 193.21 and 87.48 is: 120.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.02 : 193.21 = 87.48 : x
  2. Step 2: Convert to fraction form
    140.02/193.21 = 87.48/x
  3. Step 3: Cross multiply
    140.02x = 193.21 × 87.48
  4. Step 4: Simplify right side
    140.02x = 16,902.01
  5. Step 5: Solve for x
    x = 16,902.01/140.02
  6. Step 6: Final answer
    x = 120.71

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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.