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Finding the Fourth Proportional to 138.65, 191.17 and 94.34

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Solution

The fourth proportional to 138.65, 191.17 and 94.34 is: 130.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.65 : 191.17 = 94.34 : x
  2. Step 2: Convert to fraction form
    138.65/191.17 = 94.34/x
  3. Step 3: Cross multiply
    138.65x = 191.17 × 94.34
  4. Step 4: Simplify right side
    138.65x = 18,034.98
  5. Step 5: Solve for x
    x = 18,034.98/138.65
  6. Step 6: Final answer
    x = 130.08

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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.