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Finding the Fourth Proportional to 221.28, 332.04 and 99.64

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Solution

The fourth proportional to 221.28, 332.04 and 99.64 is: 149.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.28 : 332.04 = 99.64 : x
  2. Step 2: Convert to fraction form
    221.28/332.04 = 99.64/x
  3. Step 3: Cross multiply
    221.28x = 332.04 × 99.64
  4. Step 4: Simplify right side
    221.28x = 33,084.47
  5. Step 5: Solve for x
    x = 33,084.47/221.28
  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.