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Finding the Fourth Proportional to 139.31, 191.87 and 104.22

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Solution

The fourth proportional to 139.31, 191.87 and 104.22 is: 143.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.31 : 191.87 = 104.22 : x
  2. Step 2: Convert to fraction form
    139.31/191.87 = 104.22/x
  3. Step 3: Cross multiply
    139.31x = 191.87 × 104.22
  4. Step 4: Simplify right side
    139.31x = 19,996.69
  5. Step 5: Solve for x
    x = 19,996.69/139.31
  6. Step 6: Final answer
    x = 143.55

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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.