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Finding the Fourth Proportional to 251.20, 374.90 and 220.24

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Solution

The fourth proportional to 251.20, 374.90 and 220.24 is: 328.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.20 : 374.90 = 220.24 : x
  2. Step 2: Convert to fraction form
    251.20/374.90 = 220.24/x
  3. Step 3: Cross multiply
    251.20x = 374.90 × 220.24
  4. Step 4: Simplify right side
    251.20x = 82,567.98
  5. Step 5: Solve for x
    x = 82,567.98/251.20
  6. Step 6: Final answer
    x = 328.69

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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.