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Finding the Fourth Proportional to 834.40, 1,251.64 and 347.40

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Solution

The fourth proportional to 834.40, 1,251.64 and 347.40 is: 521.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.40 : 1,251.64 = 347.40 : x
  2. Step 2: Convert to fraction form
    834.40/1,251.64 = 347.40/x
  3. Step 3: Cross multiply
    834.40x = 1,251.64 × 347.40
  4. Step 4: Simplify right side
    834.40x = 434,819.74
  5. Step 5: Solve for x
    x = 434,819.74/834.40
  6. Step 6: Final answer
    x = 521.12

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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.