Home / 12,489.20-18,685.20-8,115.20

Finding the Fourth Proportional to 12,489.20, 18,685.20 and 8,115.20

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Solution

The fourth proportional to 12,489.20, 18,685.20 and 8,115.20 is: 12,141.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.20 : 18,685.20 = 8,115.20 : x
  2. Step 2: Convert to fraction form
    12,489.20/18,685.20 = 8,115.20/x
  3. Step 3: Cross multiply
    12,489.20x = 18,685.20 × 8,115.20
  4. Step 4: Simplify right side
    12,489.20x = 151,634,135.04
  5. Step 5: Solve for x
    x = 151,634,135.04/12,489.20
  6. Step 6: Final answer
    x = 12,141.22

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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.