Home / 3,847.20-5,309.28-2,275.20

Finding the Fourth Proportional to 3,847.20, 5,309.28 and 2,275.20

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Solution

The fourth proportional to 3,847.20, 5,309.28 and 2,275.20 is: 3,139.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,847.20 : 5,309.28 = 2,275.20 : x
  2. Step 2: Convert to fraction form
    3,847.20/5,309.28 = 2,275.20/x
  3. Step 3: Cross multiply
    3,847.20x = 5,309.28 × 2,275.20
  4. Step 4: Simplify right side
    3,847.20x = 12,079,673.86
  5. Step 5: Solve for x
    x = 12,079,673.86/3,847.20
  6. Step 6: Final answer
    x = 3,139.86

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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.