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Finding the Fourth Proportional to 138.87, 191.70 and 102.02

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Solution

The fourth proportional to 138.87, 191.70 and 102.02 is: 140.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.87 : 191.70 = 102.02 : x
  2. Step 2: Convert to fraction form
    138.87/191.70 = 102.02/x
  3. Step 3: Cross multiply
    138.87x = 191.70 × 102.02
  4. Step 4: Simplify right side
    138.87x = 19,556.28
  5. Step 5: Solve for x
    x = 19,556.28/138.87
  6. Step 6: Final answer
    x = 140.82

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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.