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Finding the Fourth Proportional to 12,642.88, 18,967.97 and 3,879.09

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Solution

The fourth proportional to 12,642.88, 18,967.97 and 3,879.09 is: 5,819.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,642.88 : 18,967.97 = 3,879.09 : x
  2. Step 2: Convert to fraction form
    12,642.88/18,967.97 = 3,879.09/x
  3. Step 3: Cross multiply
    12,642.88x = 18,967.97 × 3,879.09
  4. Step 4: Simplify right side
    12,642.88x = 73,578,348.51
  5. Step 5: Solve for x
    x = 73,578,348.51/12,642.88
  6. Step 6: Final answer
    x = 5,819.75

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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.