Home / 12,400.20-18,600.30-10,990.80

Finding the Fourth Proportional to 12,400.20, 18,600.30 and 10,990.80

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Solution

The fourth proportional to 12,400.20, 18,600.30 and 10,990.80 is: 16,486.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,400.20 : 18,600.30 = 10,990.80 : x
  2. Step 2: Convert to fraction form
    12,400.20/18,600.30 = 10,990.80/x
  3. Step 3: Cross multiply
    12,400.20x = 18,600.30 × 10,990.80
  4. Step 4: Simplify right side
    12,400.20x = 204,432,177.24
  5. Step 5: Solve for x
    x = 204,432,177.24/12,400.20
  6. Step 6: Final answer
    x = 16,486.20

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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.