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Finding the Fourth Proportional to 18,756.73, 28,142.87 and 8,221.30

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Solution

The fourth proportional to 18,756.73, 28,142.87 and 8,221.30 is: 12,335.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,756.73 : 28,142.87 = 8,221.30 : x
  2. Step 2: Convert to fraction form
    18,756.73/28,142.87 = 8,221.30/x
  3. Step 3: Cross multiply
    18,756.73x = 28,142.87 × 8,221.30
  4. Step 4: Simplify right side
    18,756.73x = 231,370,977.13
  5. Step 5: Solve for x
    x = 231,370,977.13/18,756.73
  6. Step 6: Final answer
    x = 12,335.36

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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.