Home / 13,439.92-20,156.80-5,120.88

Finding the Fourth Proportional to 13,439.92, 20,156.80 and 5,120.88

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Solution

The fourth proportional to 13,439.92, 20,156.80 and 5,120.88 is: 7,680.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,439.92 : 20,156.80 = 5,120.88 : x
  2. Step 2: Convert to fraction form
    13,439.92/20,156.80 = 5,120.88/x
  3. Step 3: Cross multiply
    13,439.92x = 20,156.80 × 5,120.88
  4. Step 4: Simplify right side
    13,439.92x = 103,220,553.98
  5. Step 5: Solve for x
    x = 103,220,553.98/13,439.92
  6. Step 6: Final answer
    x = 7,680.15

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1.5x scale

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.