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Finding the Fourth Proportional to 834.22, 1,251.33 and 643.06

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Solution

The fourth proportional to 834.22, 1,251.33 and 643.06 is: 964.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.22 : 1,251.33 = 643.06 : x
  2. Step 2: Convert to fraction form
    834.22/1,251.33 = 643.06/x
  3. Step 3: Cross multiply
    834.22x = 1,251.33 × 643.06
  4. Step 4: Simplify right side
    834.22x = 804,680.27
  5. Step 5: Solve for x
    x = 804,680.27/834.22
  6. Step 6: Final answer
    x = 964.59

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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.