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Finding the Fourth Proportional to 138.52, 191.10 and 99.64

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Solution

The fourth proportional to 138.52, 191.10 and 99.64 is: 137.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.52 : 191.10 = 99.64 : x
  2. Step 2: Convert to fraction form
    138.52/191.10 = 99.64/x
  3. Step 3: Cross multiply
    138.52x = 191.10 × 99.64
  4. Step 4: Simplify right side
    138.52x = 19,041.20
  5. Step 5: Solve for x
    x = 19,041.20/138.52
  6. Step 6: Final answer
    x = 137.46

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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.