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Finding the Fourth Proportional to 834.06, 1,251.90 and 642.90

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Solution

The fourth proportional to 834.06, 1,251.90 and 642.90 is: 964.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.06 : 1,251.90 = 642.90 : x
  2. Step 2: Convert to fraction form
    834.06/1,251.90 = 642.90/x
  3. Step 3: Cross multiply
    834.06x = 1,251.90 × 642.90
  4. Step 4: Simplify right side
    834.06x = 804,846.51
  5. Step 5: Solve for x
    x = 804,846.51/834.06
  6. Step 6: Final answer
    x = 964.97

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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.