Home / 21,979.49-30,321.64-13,021.90

Finding the Fourth Proportional to 21,979.49, 30,321.64 and 13,021.90

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Solution

The fourth proportional to 21,979.49, 30,321.64 and 13,021.90 is: 17,964.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.49 : 30,321.64 = 13,021.90 : x
  2. Step 2: Convert to fraction form
    21,979.49/30,321.64 = 13,021.90/x
  3. Step 3: Cross multiply
    21,979.49x = 30,321.64 × 13,021.90
  4. Step 4: Simplify right side
    21,979.49x = 394,845,147.20
  5. Step 5: Solve for x
    x = 394,845,147.20/21,979.49
  6. Step 6: Final answer
    x = 17,964.26

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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.