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Finding the Fourth Proportional to 747.75, 1,121.67 and 440.22

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Solution

The fourth proportional to 747.75, 1,121.67 and 440.22 is: 660.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.75 : 1,121.67 = 440.22 : x
  2. Step 2: Convert to fraction form
    747.75/1,121.67 = 440.22/x
  3. Step 3: Cross multiply
    747.75x = 1,121.67 × 440.22
  4. Step 4: Simplify right side
    747.75x = 493,781.57
  5. Step 5: Solve for x
    x = 493,781.57/747.75
  6. Step 6: Final answer
    x = 660.36

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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.