Home / 12,219.20-18,329.12-4,428.80

Finding the Fourth Proportional to 12,219.20, 18,329.12 and 4,428.80

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Solution

The fourth proportional to 12,219.20, 18,329.12 and 4,428.80 is: 6,643.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,219.20 : 18,329.12 = 4,428.80 : x
  2. Step 2: Convert to fraction form
    12,219.20/18,329.12 = 4,428.80/x
  3. Step 3: Cross multiply
    12,219.20x = 18,329.12 × 4,428.80
  4. Step 4: Simplify right side
    12,219.20x = 81,176,006.66
  5. Step 5: Solve for x
    x = 81,176,006.66/12,219.20
  6. Step 6: Final answer
    x = 6,643.32

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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.