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Finding the Fourth Proportional to 13,668.78, 18,863.12 and 7,619.02

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Solution

The fourth proportional to 13,668.78, 18,863.12 and 7,619.02 is: 10,514.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,668.78 : 18,863.12 = 7,619.02 : x
  2. Step 2: Convert to fraction form
    13,668.78/18,863.12 = 7,619.02/x
  3. Step 3: Cross multiply
    13,668.78x = 18,863.12 × 7,619.02
  4. Step 4: Simplify right side
    13,668.78x = 143,718,488.54
  5. Step 5: Solve for x
    x = 143,718,488.54/13,668.78
  6. Step 6: Final answer
    x = 10,514.36

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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.