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Finding the Fourth Proportional to 18,705.20, 28,049.70 and 7,608.20

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Solution

The fourth proportional to 18,705.20, 28,049.70 and 7,608.20 is: 11,409.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.20 : 28,049.70 = 7,608.20 : x
  2. Step 2: Convert to fraction form
    18,705.20/28,049.70 = 7,608.20/x
  3. Step 3: Cross multiply
    18,705.20x = 28,049.70 × 7,608.20
  4. Step 4: Simplify right side
    18,705.20x = 213,407,727.54
  5. Step 5: Solve for x
    x = 213,407,727.54/18,705.20
  6. Step 6: Final answer
    x = 11,409.01

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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.