Home / 20,820.36-28,731.66-11,388.60

Finding the Fourth Proportional to 20,820.36, 28,731.66 and 11,388.60

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Solution

The fourth proportional to 20,820.36, 28,731.66 and 11,388.60 is: 15,716.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.36 : 28,731.66 = 11,388.60 : x
  2. Step 2: Convert to fraction form
    20,820.36/28,731.66 = 11,388.60/x
  3. Step 3: Cross multiply
    20,820.36x = 28,731.66 × 11,388.60
  4. Step 4: Simplify right side
    20,820.36x = 327,213,383.08
  5. Step 5: Solve for x
    x = 327,213,383.08/20,820.36
  6. Step 6: Final answer
    x = 15,716.03

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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.