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Finding the Fourth Proportional to 13,659.12, 18,849.96 and 7,691.02

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Solution

The fourth proportional to 13,659.12, 18,849.96 and 7,691.02 is: 10,613.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,659.12 : 18,849.96 = 7,691.02 : x
  2. Step 2: Convert to fraction form
    13,659.12/18,849.96 = 7,691.02/x
  3. Step 3: Cross multiply
    13,659.12x = 18,849.96 × 7,691.02
  4. Step 4: Simplify right side
    13,659.12x = 144,975,419.36
  5. Step 5: Solve for x
    x = 144,975,419.36/13,659.12
  6. Step 6: Final answer
    x = 10,613.82

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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.