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Finding the Fourth Proportional to 278.09, 417.46 and 220.35

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Solution

The fourth proportional to 278.09, 417.46 and 220.35 is: 330.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.09 : 417.46 = 220.35 : x
  2. Step 2: Convert to fraction form
    278.09/417.46 = 220.35/x
  3. Step 3: Cross multiply
    278.09x = 417.46 × 220.35
  4. Step 4: Simplify right side
    278.09x = 91,987.31
  5. Step 5: Solve for x
    x = 91,987.31/278.09
  6. Step 6: Final answer
    x = 330.78

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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.