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Finding the Fourth Proportional to 318.90, 439.28 and 225.48

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Solution

The fourth proportional to 318.90, 439.28 and 225.48 is: 310.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.90 : 439.28 = 225.48 : x
  2. Step 2: Convert to fraction form
    318.90/439.28 = 225.48/x
  3. Step 3: Cross multiply
    318.90x = 439.28 × 225.48
  4. Step 4: Simplify right side
    318.90x = 99,047.73
  5. Step 5: Solve for x
    x = 99,047.73/318.90
  6. Step 6: Final answer
    x = 310.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.