Home / 21,139.13-29,172.30-11,578.80

Finding the Fourth Proportional to 21,139.13, 29,172.30 and 11,578.80

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Solution

The fourth proportional to 21,139.13, 29,172.30 and 11,578.80 is: 15,978.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.13 : 29,172.30 = 11,578.80 : x
  2. Step 2: Convert to fraction form
    21,139.13/29,172.30 = 11,578.80/x
  3. Step 3: Cross multiply
    21,139.13x = 29,172.30 × 11,578.80
  4. Step 4: Simplify right side
    21,139.13x = 337,780,194.25
  5. Step 5: Solve for x
    x = 337,780,194.25/21,139.13
  6. Step 6: Final answer
    x = 15,978.91

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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.