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Finding the Fourth Proportional to 12,879.38, 17,775.34 and 9,305.90

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Solution

The fourth proportional to 12,879.38, 17,775.34 and 9,305.90 is: 12,843.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.38 : 17,775.34 = 9,305.90 : x
  2. Step 2: Convert to fraction form
    12,879.38/17,775.34 = 9,305.90/x
  3. Step 3: Cross multiply
    12,879.38x = 17,775.34 × 9,305.90
  4. Step 4: Simplify right side
    12,879.38x = 165,415,491.02
  5. Step 5: Solve for x
    x = 165,415,491.02/12,879.38
  6. Step 6: Final answer
    x = 12,843.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.