Home / 12,939.20-19,387.20-11,081.60

Finding the Fourth Proportional to 12,939.20, 19,387.20 and 11,081.60

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Solution

The fourth proportional to 12,939.20, 19,387.20 and 11,081.60 is: 16,603.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.20 : 19,387.20 = 11,081.60 : x
  2. Step 2: Convert to fraction form
    12,939.20/19,387.20 = 11,081.60/x
  3. Step 3: Cross multiply
    12,939.20x = 19,387.20 × 11,081.60
  4. Step 4: Simplify right side
    12,939.20x = 214,841,195.52
  5. Step 5: Solve for x
    x = 214,841,195.52/12,939.20
  6. Step 6: Final answer
    x = 16,603.90

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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.