Home / 20,879.31-28,851.62-15,204.20

Finding the Fourth Proportional to 20,879.31, 28,851.62 and 15,204.20

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Solution

The fourth proportional to 20,879.31, 28,851.62 and 15,204.20 is: 21,009.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.31 : 28,851.62 = 15,204.20 : x
  2. Step 2: Convert to fraction form
    20,879.31/28,851.62 = 15,204.20/x
  3. Step 3: Cross multiply
    20,879.31x = 28,851.62 × 15,204.20
  4. Step 4: Simplify right side
    20,879.31x = 438,665,800.80
  5. Step 5: Solve for x
    x = 438,665,800.80/20,879.31
  6. Step 6: Final answer
    x = 21,009.59

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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.