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Finding the Fourth Proportional to 18,112.80, 27,169.20 and 6,427.20

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Solution

The fourth proportional to 18,112.80, 27,169.20 and 6,427.20 is: 9,640.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,112.80 : 27,169.20 = 6,427.20 : x
  2. Step 2: Convert to fraction form
    18,112.80/27,169.20 = 6,427.20/x
  3. Step 3: Cross multiply
    18,112.80x = 27,169.20 × 6,427.20
  4. Step 4: Simplify right side
    18,112.80x = 174,621,882.24
  5. Step 5: Solve for x
    x = 174,621,882.24/18,112.80
  6. Step 6: Final answer
    x = 9,640.80

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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.