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Finding the Fourth Proportional to 18,751.74, 28,131.66 and 5,605.17

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Solution

The fourth proportional to 18,751.74, 28,131.66 and 5,605.17 is: 8,408.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.74 : 28,131.66 = 5,605.17 : x
  2. Step 2: Convert to fraction form
    18,751.74/28,131.66 = 5,605.17/x
  3. Step 3: Cross multiply
    18,751.74x = 28,131.66 × 5,605.17
  4. Step 4: Simplify right side
    18,751.74x = 157,682,736.68
  5. Step 5: Solve for x
    x = 157,682,736.68/18,751.74
  6. Step 6: Final answer
    x = 8,408.97

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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.