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Finding the Fourth Proportional to 138.52, 191.07 and 99.10

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Solution

The fourth proportional to 138.52, 191.07 and 99.10 is: 136.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.52 : 191.07 = 99.10 : x
  2. Step 2: Convert to fraction form
    138.52/191.07 = 99.10/x
  3. Step 3: Cross multiply
    138.52x = 191.07 × 99.10
  4. Step 4: Simplify right side
    138.52x = 18,935.04
  5. Step 5: Solve for x
    x = 18,935.04/138.52
  6. Step 6: Final answer
    x = 136.70

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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.