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Finding the Fourth Proportional to 318.28, 439.38 and 213.49

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Solution

The fourth proportional to 318.28, 439.38 and 213.49 is: 294.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.28 : 439.38 = 213.49 : x
  2. Step 2: Convert to fraction form
    318.28/439.38 = 213.49/x
  3. Step 3: Cross multiply
    318.28x = 439.38 × 213.49
  4. Step 4: Simplify right side
    318.28x = 93,803.24
  5. Step 5: Solve for x
    x = 93,803.24/318.28
  6. Step 6: Final answer
    x = 294.72

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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.