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Finding the Fourth Proportional to 747.18, 1,120.38 and 439.64

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Solution

The fourth proportional to 747.18, 1,120.38 and 439.64 is: 659.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.18 : 1,120.38 = 439.64 : x
  2. Step 2: Convert to fraction form
    747.18/1,120.38 = 439.64/x
  3. Step 3: Cross multiply
    747.18x = 1,120.38 × 439.64
  4. Step 4: Simplify right side
    747.18x = 492,558.26
  5. Step 5: Solve for x
    x = 492,558.26/747.18
  6. Step 6: Final answer
    x = 659.22

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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.