Home / 12,219.20-18,329.40-6,387.20

Finding the Fourth Proportional to 12,219.20, 18,329.40 and 6,387.20

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Solution

The fourth proportional to 12,219.20, 18,329.40 and 6,387.20 is: 9,581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,219.20 : 18,329.40 = 6,387.20 : x
  2. Step 2: Convert to fraction form
    12,219.20/18,329.40 = 6,387.20/x
  3. Step 3: Cross multiply
    12,219.20x = 18,329.40 × 6,387.20
  4. Step 4: Simplify right side
    12,219.20x = 117,073,543.68
  5. Step 5: Solve for x
    x = 117,073,543.68/12,219.20
  6. Step 6: Final answer
    x = 9,581.11

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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.