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Finding the Fourth Proportional to 220.83, 330.90 and 143.73

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Solution

The fourth proportional to 220.83, 330.90 and 143.73 is: 215.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.83 : 330.90 = 143.73 : x
  2. Step 2: Convert to fraction form
    220.83/330.90 = 143.73/x
  3. Step 3: Cross multiply
    220.83x = 330.90 × 143.73
  4. Step 4: Simplify right side
    220.83x = 47,560.26
  5. Step 5: Solve for x
    x = 47,560.26/220.83
  6. Step 6: Final answer
    x = 215.37

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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.