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Finding the Fourth Proportional to 165.12, 227.90 and 99.61

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Solution

The fourth proportional to 165.12, 227.90 and 99.61 is: 137.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.12 : 227.90 = 99.61 : x
  2. Step 2: Convert to fraction form
    165.12/227.90 = 99.61/x
  3. Step 3: Cross multiply
    165.12x = 227.90 × 99.61
  4. Step 4: Simplify right side
    165.12x = 22,701.12
  5. Step 5: Solve for x
    x = 22,701.12/165.12
  6. Step 6: Final answer
    x = 137.48

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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.