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Finding the Fourth Proportional to 12,003.20, 18,010.20 and 5,760.80

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Solution

The fourth proportional to 12,003.20, 18,010.20 and 5,760.80 is: 8,643.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,003.20 : 18,010.20 = 5,760.80 : x
  2. Step 2: Convert to fraction form
    12,003.20/18,010.20 = 5,760.80/x
  3. Step 3: Cross multiply
    12,003.20x = 18,010.20 × 5,760.80
  4. Step 4: Simplify right side
    12,003.20x = 103,753,160.16
  5. Step 5: Solve for x
    x = 103,753,160.16/12,003.20
  6. Step 6: Final answer
    x = 8,643.79

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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.