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Finding the Fourth Proportional to 834.40, 1,251.28 and 286.43

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Solution

The fourth proportional to 834.40, 1,251.28 and 286.43 is: 429.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.40 : 1,251.28 = 286.43 : x
  2. Step 2: Convert to fraction form
    834.40/1,251.28 = 286.43/x
  3. Step 3: Cross multiply
    834.40x = 1,251.28 × 286.43
  4. Step 4: Simplify right side
    834.40x = 358,406.54
  5. Step 5: Solve for x
    x = 358,406.54/834.40
  6. Step 6: Final answer
    x = 429.54

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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.