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Finding the Fourth Proportional to 13,687.74, 20,531.60 and 3,299.48

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Solution

The fourth proportional to 13,687.74, 20,531.60 and 3,299.48 is: 4,949.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.74 : 20,531.60 = 3,299.48 : x
  2. Step 2: Convert to fraction form
    13,687.74/20,531.60 = 3,299.48/x
  3. Step 3: Cross multiply
    13,687.74x = 20,531.60 × 3,299.48
  4. Step 4: Simplify right side
    13,687.74x = 67,743,603.57
  5. Step 5: Solve for x
    x = 67,743,603.57/13,687.74
  6. Step 6: Final answer
    x = 4,949.22

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1.5x scale

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.