Home / 12,729.20-19,109.40-8,049.20

Finding the Fourth Proportional to 12,729.20, 19,109.40 and 8,049.20

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Solution

The fourth proportional to 12,729.20, 19,109.40 and 8,049.20 is: 12,083.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,729.20 : 19,109.40 = 8,049.20 : x
  2. Step 2: Convert to fraction form
    12,729.20/19,109.40 = 8,049.20/x
  3. Step 3: Cross multiply
    12,729.20x = 19,109.40 × 8,049.20
  4. Step 4: Simplify right side
    12,729.20x = 153,815,382.48
  5. Step 5: Solve for x
    x = 153,815,382.48/12,729.20
  6. Step 6: Final answer
    x = 12,083.66

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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.