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Finding the Fourth Proportional to 221.30, 332.06 and 91.28

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Solution

The fourth proportional to 221.30, 332.06 and 91.28 is: 136.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.30 : 332.06 = 91.28 : x
  2. Step 2: Convert to fraction form
    221.30/332.06 = 91.28/x
  3. Step 3: Cross multiply
    221.30x = 332.06 × 91.28
  4. Step 4: Simplify right side
    221.30x = 30,309.00
  5. Step 5: Solve for x
    x = 30,309.00/221.30
  6. Step 6: Final answer
    x = 136.96

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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.