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Finding the Fourth Proportional to 221.60, 332.12 and 99.76

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Solution

The fourth proportional to 221.60, 332.12 and 99.76 is: 149.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.60 : 332.12 = 99.76 : x
  2. Step 2: Convert to fraction form
    221.60/332.12 = 99.76/x
  3. Step 3: Cross multiply
    221.60x = 332.12 × 99.76
  4. Step 4: Simplify right side
    221.60x = 33,132.29
  5. Step 5: Solve for x
    x = 33,132.29/221.60
  6. Step 6: Final answer
    x = 149.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.