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Finding the Fourth Proportional to 833.28, 1,247.85 and 422.61

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Solution

The fourth proportional to 833.28, 1,247.85 and 422.61 is: 632.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.28 : 1,247.85 = 422.61 : x
  2. Step 2: Convert to fraction form
    833.28/1,247.85 = 422.61/x
  3. Step 3: Cross multiply
    833.28x = 1,247.85 × 422.61
  4. Step 4: Simplify right side
    833.28x = 527,353.89
  5. Step 5: Solve for x
    x = 527,353.89/833.28
  6. Step 6: Final answer
    x = 632.87

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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.