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Finding the Fourth Proportional to 834.79, 1,251.28 and 628.70

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Solution

The fourth proportional to 834.79, 1,251.28 and 628.70 is: 942.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.79 : 1,251.28 = 628.70 : x
  2. Step 2: Convert to fraction form
    834.79/1,251.28 = 628.70/x
  3. Step 3: Cross multiply
    834.79x = 1,251.28 × 628.70
  4. Step 4: Simplify right side
    834.79x = 786,679.74
  5. Step 5: Solve for x
    x = 786,679.74/834.79
  6. Step 6: Final answer
    x = 942.37

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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.