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Finding the Fourth Proportional to 834.02, 1,249.21 and 422.45

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Solution

The fourth proportional to 834.02, 1,249.21 and 422.45 is: 632.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.02 : 1,249.21 = 422.45 : x
  2. Step 2: Convert to fraction form
    834.02/1,249.21 = 422.45/x
  3. Step 3: Cross multiply
    834.02x = 1,249.21 × 422.45
  4. Step 4: Simplify right side
    834.02x = 527,732.42
  5. Step 5: Solve for x
    x = 527,732.42/834.02
  6. Step 6: Final answer
    x = 632.76

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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.