Home / 21,721.83-29,979.33-13,764.78

Finding the Fourth Proportional to 21,721.83, 29,979.33 and 13,764.78

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Solution

The fourth proportional to 21,721.83, 29,979.33 and 13,764.78 is: 18,997.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.83 : 29,979.33 = 13,764.78 : x
  2. Step 2: Convert to fraction form
    21,721.83/29,979.33 = 13,764.78/x
  3. Step 3: Cross multiply
    21,721.83x = 29,979.33 × 13,764.78
  4. Step 4: Simplify right side
    21,721.83x = 412,658,882.00
  5. Step 5: Solve for x
    x = 412,658,882.00/21,721.83
  6. Step 6: Final answer
    x = 18,997.43

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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.