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Finding the Fourth Proportional to 18,881.28, 28,321.28 and 7,194.08

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Solution

The fourth proportional to 18,881.28, 28,321.28 and 7,194.08 is: 10,790.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,881.28 : 28,321.28 = 7,194.08 : x
  2. Step 2: Convert to fraction form
    18,881.28/28,321.28 = 7,194.08/x
  3. Step 3: Cross multiply
    18,881.28x = 28,321.28 × 7,194.08
  4. Step 4: Simplify right side
    18,881.28x = 203,745,554.02
  5. Step 5: Solve for x
    x = 203,745,554.02/18,881.28
  6. Step 6: Final answer
    x = 10,790.88

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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.