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Finding the Fourth Proportional to 747.89, 1,121.87 and 439.89

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Solution

The fourth proportional to 747.89, 1,121.87 and 439.89 is: 659.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.89 : 1,121.87 = 439.89 : x
  2. Step 2: Convert to fraction form
    747.89/1,121.87 = 439.89/x
  3. Step 3: Cross multiply
    747.89x = 1,121.87 × 439.89
  4. Step 4: Simplify right side
    747.89x = 493,499.39
  5. Step 5: Solve for x
    x = 493,499.39/747.89
  6. Step 6: Final answer
    x = 659.86

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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.