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Finding the Fourth Proportional to 18,873.18, 28,309.74 and 8,472.78

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Solution

The fourth proportional to 18,873.18, 28,309.74 and 8,472.78 is: 12,709.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,873.18 : 28,309.74 = 8,472.78 : x
  2. Step 2: Convert to fraction form
    18,873.18/28,309.74 = 8,472.78/x
  3. Step 3: Cross multiply
    18,873.18x = 28,309.74 × 8,472.78
  4. Step 4: Simplify right side
    18,873.18x = 239,862,198.88
  5. Step 5: Solve for x
    x = 239,862,198.88/18,873.18
  6. Step 6: Final answer
    x = 12,709.16

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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.