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Finding the Fourth Proportional to 747.56, 1,120.12 and 439.68

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Solution

The fourth proportional to 747.56, 1,120.12 and 439.68 is: 658.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.56 : 1,120.12 = 439.68 : x
  2. Step 2: Convert to fraction form
    747.56/1,120.12 = 439.68/x
  3. Step 3: Cross multiply
    747.56x = 1,120.12 × 439.68
  4. Step 4: Simplify right side
    747.56x = 492,494.36
  5. Step 5: Solve for x
    x = 492,494.36/747.56
  6. Step 6: Final answer
    x = 658.80

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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.