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Finding the Fourth Proportional to 278.65, 417.32 and 220.48

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Solution

The fourth proportional to 278.65, 417.32 and 220.48 is: 330.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.65 : 417.32 = 220.48 : x
  2. Step 2: Convert to fraction form
    278.65/417.32 = 220.48/x
  3. Step 3: Cross multiply
    278.65x = 417.32 × 220.48
  4. Step 4: Simplify right side
    278.65x = 92,008.63
  5. Step 5: Solve for x
    x = 92,008.63/278.65
  6. Step 6: Final answer
    x = 330.20

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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.