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Finding the Fourth Proportional to 13,691.11, 18,893.39 and 7,722.31

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Solution

The fourth proportional to 13,691.11, 18,893.39 and 7,722.31 is: 10,656.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,691.11 : 18,893.39 = 7,722.31 : x
  2. Step 2: Convert to fraction form
    13,691.11/18,893.39 = 7,722.31/x
  3. Step 3: Cross multiply
    13,691.11x = 18,893.39 × 7,722.31
  4. Step 4: Simplify right side
    13,691.11x = 145,900,481.45
  5. Step 5: Solve for x
    x = 145,900,481.45/13,691.11
  6. Step 6: Final answer
    x = 10,656.59

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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.