Home / 20,611.20-28,443.12-11,179.92

Finding the Fourth Proportional to 20,611.20, 28,443.12 and 11,179.92

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Solution

The fourth proportional to 20,611.20, 28,443.12 and 11,179.92 is: 15,428.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.20 : 28,443.12 = 11,179.92 : x
  2. Step 2: Convert to fraction form
    20,611.20/28,443.12 = 11,179.92/x
  3. Step 3: Cross multiply
    20,611.20x = 28,443.12 × 11,179.92
  4. Step 4: Simplify right side
    20,611.20x = 317,991,806.15
  5. Step 5: Solve for x
    x = 317,991,806.15/20,611.20
  6. Step 6: Final answer
    x = 15,428.11

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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.