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Finding the Fourth Proportional to 18,917.10, 28,371.08 and 8,381.30

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Solution

The fourth proportional to 18,917.10, 28,371.08 and 8,381.30 is: 12,569.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.10 : 28,371.08 = 8,381.30 : x
  2. Step 2: Convert to fraction form
    18,917.10/28,371.08 = 8,381.30/x
  3. Step 3: Cross multiply
    18,917.10x = 28,371.08 × 8,381.30
  4. Step 4: Simplify right side
    18,917.10x = 237,786,349.04
  5. Step 5: Solve for x
    x = 237,786,349.04/18,917.10
  6. Step 6: Final answer
    x = 12,569.92

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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.