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Finding the Fourth Proportional to 8,206.81, 12,312.16 and 2,660.16

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Solution

The fourth proportional to 8,206.81, 12,312.16 and 2,660.16 is: 3,990.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,206.81 : 12,312.16 = 2,660.16 : x
  2. Step 2: Convert to fraction form
    8,206.81/12,312.16 = 2,660.16/x
  3. Step 3: Cross multiply
    8,206.81x = 12,312.16 × 2,660.16
  4. Step 4: Simplify right side
    8,206.81x = 32,752,293.29
  5. Step 5: Solve for x
    x = 32,752,293.29/8,206.81
  6. Step 6: Final answer
    x = 3,990.87

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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.