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Finding the Fourth Proportional to 18,806.61, 28,205.24 and 7,716.39

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Solution

The fourth proportional to 18,806.61, 28,205.24 and 7,716.39 is: 11,572.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,806.61 : 28,205.24 = 7,716.39 : x
  2. Step 2: Convert to fraction form
    18,806.61/28,205.24 = 7,716.39/x
  3. Step 3: Cross multiply
    18,806.61x = 28,205.24 × 7,716.39
  4. Step 4: Simplify right side
    18,806.61x = 217,642,593.30
  5. Step 5: Solve for x
    x = 217,642,593.30/18,806.61
  6. Step 6: Final answer
    x = 11,572.66

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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.