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Finding the Fourth Proportional to 5,739.28, 7,920.60 and 3,221.68

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Solution

The fourth proportional to 5,739.28, 7,920.60 and 3,221.68 is: 4,446.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,739.28 : 7,920.60 = 3,221.68 : x
  2. Step 2: Convert to fraction form
    5,739.28/7,920.60 = 3,221.68/x
  3. Step 3: Cross multiply
    5,739.28x = 7,920.60 × 3,221.68
  4. Step 4: Simplify right side
    5,739.28x = 25,517,638.61
  5. Step 5: Solve for x
    x = 25,517,638.61/5,739.28
  6. Step 6: Final answer
    x = 4,446.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.