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Finding the Fourth Proportional to 13,660.14, 18,850.78 and 7,691.79

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Solution

The fourth proportional to 13,660.14, 18,850.78 and 7,691.79 is: 10,614.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,660.14 : 18,850.78 = 7,691.79 : x
  2. Step 2: Convert to fraction form
    13,660.14/18,850.78 = 7,691.79/x
  3. Step 3: Cross multiply
    13,660.14x = 18,850.78 × 7,691.79
  4. Step 4: Simplify right side
    13,660.14x = 144,996,241.10
  5. Step 5: Solve for x
    x = 144,996,241.10/13,660.14
  6. Step 6: Final answer
    x = 10,614.55

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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.