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Finding the Fourth Proportional to 12,456.69, 18,685.10 and 3,691.68

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Solution

The fourth proportional to 12,456.69, 18,685.10 and 3,691.68 is: 5,537.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,456.69 : 18,685.10 = 3,691.68 : x
  2. Step 2: Convert to fraction form
    12,456.69/18,685.10 = 3,691.68/x
  3. Step 3: Cross multiply
    12,456.69x = 18,685.10 × 3,691.68
  4. Step 4: Simplify right side
    12,456.69x = 68,979,409.97
  5. Step 5: Solve for x
    x = 68,979,409.97/12,456.69
  6. Step 6: Final answer
    x = 5,537.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.