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Finding the Fourth Proportional to 13,679.92, 18,880.68 and 8,091.28

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Solution

The fourth proportional to 13,679.92, 18,880.68 and 8,091.28 is: 11,167.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679.92 : 18,880.68 = 8,091.28 : x
  2. Step 2: Convert to fraction form
    13,679.92/18,880.68 = 8,091.28/x
  3. Step 3: Cross multiply
    13,679.92x = 18,880.68 × 8,091.28
  4. Step 4: Simplify right side
    13,679.92x = 152,768,868.47
  5. Step 5: Solve for x
    x = 152,768,868.47/13,679.92
  6. Step 6: Final answer
    x = 11,167.38

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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.