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Finding the Fourth Proportional to 834.28, 1,251 and 278.79

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Solution

The fourth proportional to 834.28, 1,251 and 278.79 is: 418.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.28 : 1,251 = 278.79 : x
  2. Step 2: Convert to fraction form
    834.28/1,251 = 278.79/x
  3. Step 3: Cross multiply
    834.28x = 1,251 × 278.79
  4. Step 4: Simplify right side
    834.28x = 348,766.29
  5. Step 5: Solve for x
    x = 348,766.29/834.28
  6. Step 6: Final answer
    x = 418.04

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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.