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Finding the Fourth Proportional to 13,659.64, 18,850.09 and 7,691.29

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Solution

The fourth proportional to 13,659.64, 18,850.09 and 7,691.29 is: 10,613.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,659.64 : 18,850.09 = 7,691.29 : x
  2. Step 2: Convert to fraction form
    13,659.64/18,850.09 = 7,691.29/x
  3. Step 3: Cross multiply
    13,659.64x = 18,850.09 × 7,691.29
  4. Step 4: Simplify right side
    13,659.64x = 144,981,376.01
  5. Step 5: Solve for x
    x = 144,981,376.01/13,659.64
  6. Step 6: Final answer
    x = 10,613.85

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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.