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Finding the Fourth Proportional to 249.64, 372.52 and 221.20

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Solution

The fourth proportional to 249.64, 372.52 and 221.20 is: 330.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.64 : 372.52 = 221.20 : x
  2. Step 2: Convert to fraction form
    249.64/372.52 = 221.20/x
  3. Step 3: Cross multiply
    249.64x = 372.52 × 221.20
  4. Step 4: Simplify right side
    249.64x = 82,401.42
  5. Step 5: Solve for x
    x = 82,401.42/249.64
  6. Step 6: Final answer
    x = 330.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.