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Finding the Fourth Proportional to 12,879.56, 17,772.72 and 11,939.24

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Solution

The fourth proportional to 12,879.56, 17,772.72 and 11,939.24 is: 16,475.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.56 : 17,772.72 = 11,939.24 : x
  2. Step 2: Convert to fraction form
    12,879.56/17,772.72 = 11,939.24/x
  3. Step 3: Cross multiply
    12,879.56x = 17,772.72 × 11,939.24
  4. Step 4: Simplify right side
    12,879.56x = 212,192,769.53
  5. Step 5: Solve for x
    x = 212,192,769.53/12,879.56
  6. Step 6: Final answer
    x = 16,475.16

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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.