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Finding the Fourth Proportional to 18,687.79, 28,037.10 and 5,540.48

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Solution

The fourth proportional to 18,687.79, 28,037.10 and 5,540.48 is: 8,312.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.79 : 28,037.10 = 5,540.48 : x
  2. Step 2: Convert to fraction form
    18,687.79/28,037.10 = 5,540.48/x
  3. Step 3: Cross multiply
    18,687.79x = 28,037.10 × 5,540.48
  4. Step 4: Simplify right side
    18,687.79x = 155,338,977.54
  5. Step 5: Solve for x
    x = 155,338,977.54/18,687.79
  6. Step 6: Final answer
    x = 8,312.32

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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.