Home / 5,639.28-7,781.52-3,121.20

Finding the Fourth Proportional to 5,639.28, 7,781.52 and 3,121.20

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Solution

The fourth proportional to 5,639.28, 7,781.52 and 3,121.20 is: 4,306.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,639.28 : 7,781.52 = 3,121.20 : x
  2. Step 2: Convert to fraction form
    5,639.28/7,781.52 = 3,121.20/x
  3. Step 3: Cross multiply
    5,639.28x = 7,781.52 × 3,121.20
  4. Step 4: Simplify right side
    5,639.28x = 24,287,680.22
  5. Step 5: Solve for x
    x = 24,287,680.22/5,639.28
  6. Step 6: Final answer
    x = 4,306.88

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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.