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Finding the Fourth Proportional to 166.12, 229.28 and 99.77

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Solution

The fourth proportional to 166.12, 229.28 and 99.77 is: 137.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.12 : 229.28 = 99.77 : x
  2. Step 2: Convert to fraction form
    166.12/229.28 = 99.77/x
  3. Step 3: Cross multiply
    166.12x = 229.28 × 99.77
  4. Step 4: Simplify right side
    166.12x = 22,874.12
  5. Step 5: Solve for x
    x = 22,874.12/166.12
  6. Step 6: Final answer
    x = 137.70

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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.