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Finding the Fourth Proportional to 18,791.58, 25,920.99 and 12,418.23

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Solution

The fourth proportional to 18,791.58, 25,920.99 and 12,418.23 is: 17,129.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.58 : 25,920.99 = 12,418.23 : x
  2. Step 2: Convert to fraction form
    18,791.58/25,920.99 = 12,418.23/x
  3. Step 3: Cross multiply
    18,791.58x = 25,920.99 × 12,418.23
  4. Step 4: Simplify right side
    18,791.58x = 321,892,815.65
  5. Step 5: Solve for x
    x = 321,892,815.65/18,791.58
  6. Step 6: Final answer
    x = 17,129.63

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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.