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Finding the Fourth Proportional to 13,672.32, 18,865.28 and 8,081.92

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Solution

The fourth proportional to 13,672.32, 18,865.28 and 8,081.92 is: 11,151.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,672.32 : 18,865.28 = 8,081.92 : x
  2. Step 2: Convert to fraction form
    13,672.32/18,865.28 = 8,081.92/x
  3. Step 3: Cross multiply
    13,672.32x = 18,865.28 × 8,081.92
  4. Step 4: Simplify right side
    13,672.32x = 152,467,683.74
  5. Step 5: Solve for x
    x = 152,467,683.74/13,672.32
  6. Step 6: Final answer
    x = 11,151.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.