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Finding the Fourth Proportional to 278.79, 418.31 and 170.66

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Solution

The fourth proportional to 278.79, 418.31 and 170.66 is: 256.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.79 : 418.31 = 170.66 : x
  2. Step 2: Convert to fraction form
    278.79/418.31 = 170.66/x
  3. Step 3: Cross multiply
    278.79x = 418.31 × 170.66
  4. Step 4: Simplify right side
    278.79x = 71,385.84
  5. Step 5: Solve for x
    x = 71,385.84/278.79
  6. Step 6: Final answer
    x = 256.06

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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.