Home / 20,991.36-28,961.52-11,915.22

Finding the Fourth Proportional to 20,991.36, 28,961.52 and 11,915.22

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Solution

The fourth proportional to 20,991.36, 28,961.52 and 11,915.22 is: 16,439.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.36 : 28,961.52 = 11,915.22 : x
  2. Step 2: Convert to fraction form
    20,991.36/28,961.52 = 11,915.22/x
  3. Step 3: Cross multiply
    20,991.36x = 28,961.52 × 11,915.22
  4. Step 4: Simplify right side
    20,991.36x = 345,082,882.33
  5. Step 5: Solve for x
    x = 345,082,882.33/20,991.36
  6. Step 6: Final answer
    x = 16,439.28

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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.