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Finding the Fourth Proportional to 278.38, 417.30 and 220.46

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Solution

The fourth proportional to 278.38, 417.30 and 220.46 is: 330.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.38 : 417.30 = 220.46 : x
  2. Step 2: Convert to fraction form
    278.38/417.30 = 220.46/x
  3. Step 3: Cross multiply
    278.38x = 417.30 × 220.46
  4. Step 4: Simplify right side
    278.38x = 91,997.96
  5. Step 5: Solve for x
    x = 91,997.96/278.38
  6. Step 6: Final answer
    x = 330.48

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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.