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Finding the Fourth Proportional to 21,974.40, 32,954.40 and 8,121.60

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Solution

The fourth proportional to 21,974.40, 32,954.40 and 8,121.60 is: 12,179.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,974.40 : 32,954.40 = 8,121.60 : x
  2. Step 2: Convert to fraction form
    21,974.40/32,954.40 = 8,121.60/x
  3. Step 3: Cross multiply
    21,974.40x = 32,954.40 × 8,121.60
  4. Step 4: Simplify right side
    21,974.40x = 267,642,455.04
  5. Step 5: Solve for x
    x = 267,642,455.04/21,974.40
  6. Step 6: Final answer
    x = 12,179.74

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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.