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Finding the Fourth Proportional to 773.80, 1,161.04 and 426.72

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Solution

The fourth proportional to 773.80, 1,161.04 and 426.72 is: 640.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.80 : 1,161.04 = 426.72 : x
  2. Step 2: Convert to fraction form
    773.80/1,161.04 = 426.72/x
  3. Step 3: Cross multiply
    773.80x = 1,161.04 × 426.72
  4. Step 4: Simplify right side
    773.80x = 495,438.99
  5. Step 5: Solve for x
    x = 495,438.99/773.80
  6. Step 6: Final answer
    x = 640.27

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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.