Home / 12,215.20-18,322.80-4,819.90

Finding the Fourth Proportional to 12,215.20, 18,322.80 and 4,819.90

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Solution

The fourth proportional to 12,215.20, 18,322.80 and 4,819.90 is: 7,229.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,215.20 : 18,322.80 = 4,819.90 : x
  2. Step 2: Convert to fraction form
    12,215.20/18,322.80 = 4,819.90/x
  3. Step 3: Cross multiply
    12,215.20x = 18,322.80 × 4,819.90
  4. Step 4: Simplify right side
    12,215.20x = 88,314,063.72
  5. Step 5: Solve for x
    x = 88,314,063.72/12,215.20
  6. Step 6: Final answer
    x = 7,229.85

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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.