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Finding the Fourth Proportional to 278.62, 418.12 and 170.48

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Solution

The fourth proportional to 278.62, 418.12 and 170.48 is: 255.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.62 : 418.12 = 170.48 : x
  2. Step 2: Convert to fraction form
    278.62/418.12 = 170.48/x
  3. Step 3: Cross multiply
    278.62x = 418.12 × 170.48
  4. Step 4: Simplify right side
    278.62x = 71,281.10
  5. Step 5: Solve for x
    x = 71,281.10/278.62
  6. Step 6: Final answer
    x = 255.84

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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.