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Finding the Fourth Proportional to 318.19, 439 and 213.43

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Solution

The fourth proportional to 318.19, 439 and 213.43 is: 294.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.19 : 439 = 213.43 : x
  2. Step 2: Convert to fraction form
    318.19/439 = 213.43/x
  3. Step 3: Cross multiply
    318.19x = 439 × 213.43
  4. Step 4: Simplify right side
    318.19x = 93,695.77
  5. Step 5: Solve for x
    x = 93,695.77/318.19
  6. Step 6: Final answer
    x = 294.46

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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.