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Finding the Fourth Proportional to 140.35, 193.73 and 87.90

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Solution

The fourth proportional to 140.35, 193.73 and 87.90 is: 121.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.35 : 193.73 = 87.90 : x
  2. Step 2: Convert to fraction form
    140.35/193.73 = 87.90/x
  3. Step 3: Cross multiply
    140.35x = 193.73 × 87.90
  4. Step 4: Simplify right side
    140.35x = 17,028.87
  5. Step 5: Solve for x
    x = 17,028.87/140.35
  6. Step 6: Final answer
    x = 121.33

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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.