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Finding the Fourth Proportional to 8,790.92, 12,131.42 and 4,812

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Solution

The fourth proportional to 8,790.92, 12,131.42 and 4,812 is: 6,640.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,790.92 : 12,131.42 = 4,812 : x
  2. Step 2: Convert to fraction form
    8,790.92/12,131.42 = 4,812/x
  3. Step 3: Cross multiply
    8,790.92x = 12,131.42 × 4,812
  4. Step 4: Simplify right side
    8,790.92x = 58,376,393.04
  5. Step 5: Solve for x
    x = 58,376,393.04/8,790.92
  6. Step 6: Final answer
    x = 6,640.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.