Home / 7,121.28-9,826.74-3,976.86

Finding the Fourth Proportional to 7,121.28, 9,826.74 and 3,976.86

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Solution

The fourth proportional to 7,121.28, 9,826.74 and 3,976.86 is: 5,487.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.28 : 9,826.74 = 3,976.86 : x
  2. Step 2: Convert to fraction form
    7,121.28/9,826.74 = 3,976.86/x
  3. Step 3: Cross multiply
    7,121.28x = 9,826.74 × 3,976.86
  4. Step 4: Simplify right side
    7,121.28x = 39,079,569.24
  5. Step 5: Solve for x
    x = 39,079,569.24/7,121.28
  6. Step 6: Final answer
    x = 5,487.72

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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.