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Finding the Fourth Proportional to 221.64, 332.30 and 99.90

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Solution

The fourth proportional to 221.64, 332.30 and 99.90 is: 149.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.64 : 332.30 = 99.90 : x
  2. Step 2: Convert to fraction form
    221.64/332.30 = 99.90/x
  3. Step 3: Cross multiply
    221.64x = 332.30 × 99.90
  4. Step 4: Simplify right side
    221.64x = 33,196.27
  5. Step 5: Solve for x
    x = 33,196.27/221.64
  6. Step 6: Final answer
    x = 149.78

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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.