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Finding the Fourth Proportional to 18,834.08, 28,248.38 and 7,147.28

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Solution

The fourth proportional to 18,834.08, 28,248.38 and 7,147.28 is: 10,719.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,834.08 : 28,248.38 = 7,147.28 : x
  2. Step 2: Convert to fraction form
    18,834.08/28,248.38 = 7,147.28/x
  3. Step 3: Cross multiply
    18,834.08x = 28,248.38 × 7,147.28
  4. Step 4: Simplify right side
    18,834.08x = 201,899,081.41
  5. Step 5: Solve for x
    x = 201,899,081.41/18,834.08
  6. Step 6: Final answer
    x = 10,719.88

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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.