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Finding the Fourth Proportional to 138.52, 191.01 and 89.43

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Solution

The fourth proportional to 138.52, 191.01 and 89.43 is: 123.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.52 : 191.01 = 89.43 : x
  2. Step 2: Convert to fraction form
    138.52/191.01 = 89.43/x
  3. Step 3: Cross multiply
    138.52x = 191.01 × 89.43
  4. Step 4: Simplify right side
    138.52x = 17,082.02
  5. Step 5: Solve for x
    x = 17,082.02/138.52
  6. Step 6: Final answer
    x = 123.32

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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.