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Finding the Fourth Proportional to 13,717.56, 20,517.54 and 12,721.56

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Solution

The fourth proportional to 13,717.56, 20,517.54 and 12,721.56 is: 19,027.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,717.56 : 20,517.54 = 12,721.56 : x
  2. Step 2: Convert to fraction form
    13,717.56/20,517.54 = 12,721.56/x
  3. Step 3: Cross multiply
    13,717.56x = 20,517.54 × 12,721.56
  4. Step 4: Simplify right side
    13,717.56x = 261,015,116.16
  5. Step 5: Solve for x
    x = 261,015,116.16/13,717.56
  6. Step 6: Final answer
    x = 19,027.81

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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.