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Finding the Fourth Proportional to 221.43, 332.18 and 187.11

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Solution

The fourth proportional to 221.43, 332.18 and 187.11 is: 280.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.43 : 332.18 = 187.11 : x
  2. Step 2: Convert to fraction form
    221.43/332.18 = 187.11/x
  3. Step 3: Cross multiply
    221.43x = 332.18 × 187.11
  4. Step 4: Simplify right side
    221.43x = 62,153.26
  5. Step 5: Solve for x
    x = 62,153.26/221.43
  6. Step 6: Final answer
    x = 280.69

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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.