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Finding the Fourth Proportional to 18,812.28, 28,218.42 and 8,409.72

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Solution

The fourth proportional to 18,812.28, 28,218.42 and 8,409.72 is: 12,614.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,812.28 : 28,218.42 = 8,409.72 : x
  2. Step 2: Convert to fraction form
    18,812.28/28,218.42 = 8,409.72/x
  3. Step 3: Cross multiply
    18,812.28x = 28,218.42 × 8,409.72
  4. Step 4: Simplify right side
    18,812.28x = 237,309,011.04
  5. Step 5: Solve for x
    x = 237,309,011.04/18,812.28
  6. Step 6: Final answer
    x = 12,614.58

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Similar ratio
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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.