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Finding the Fourth Proportional to 8,116.40, 12,179.40 and 2,921.60

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Solution

The fourth proportional to 8,116.40, 12,179.40 and 2,921.60 is: 4,384.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,116.40 : 12,179.40 = 2,921.60 : x
  2. Step 2: Convert to fraction form
    8,116.40/12,179.40 = 2,921.60/x
  3. Step 3: Cross multiply
    8,116.40x = 12,179.40 × 2,921.60
  4. Step 4: Simplify right side
    8,116.40x = 35,583,335.04
  5. Step 5: Solve for x
    x = 35,583,335.04/8,116.40
  6. Step 6: Final answer
    x = 4,384.13

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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.