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Finding the Fourth Proportional to 15,061.14, 20,786.61 and 8,686.54

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Solution

The fourth proportional to 15,061.14, 20,786.61 and 8,686.54 is: 11,988.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,061.14 : 20,786.61 = 8,686.54 : x
  2. Step 2: Convert to fraction form
    15,061.14/20,786.61 = 8,686.54/x
  3. Step 3: Cross multiply
    15,061.14x = 20,786.61 × 8,686.54
  4. Step 4: Simplify right side
    15,061.14x = 180,563,593.58
  5. Step 5: Solve for x
    x = 180,563,593.58/15,061.14
  6. Step 6: Final answer
    x = 11,988.71

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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.