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Finding the Fourth Proportional to 13,382.40, 20,073.60 and 6,821.40

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Solution

The fourth proportional to 13,382.40, 20,073.60 and 6,821.40 is: 10,232.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,382.40 : 20,073.60 = 6,821.40 : x
  2. Step 2: Convert to fraction form
    13,382.40/20,073.60 = 6,821.40/x
  3. Step 3: Cross multiply
    13,382.40x = 20,073.60 × 6,821.40
  4. Step 4: Simplify right side
    13,382.40x = 136,930,055.04
  5. Step 5: Solve for x
    x = 136,930,055.04/13,382.40
  6. Step 6: Final answer
    x = 10,232.10

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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.