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Finding the Fourth Proportional to 220.43, 330.84 and 143.43

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Solution

The fourth proportional to 220.43, 330.84 and 143.43 is: 215.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.43 : 330.84 = 143.43 : x
  2. Step 2: Convert to fraction form
    220.43/330.84 = 143.43/x
  3. Step 3: Cross multiply
    220.43x = 330.84 × 143.43
  4. Step 4: Simplify right side
    220.43x = 47,452.38
  5. Step 5: Solve for x
    x = 47,452.38/220.43
  6. Step 6: Final answer
    x = 215.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.