Home / 21,151.22-31,728.78-6,919.79

Finding the Fourth Proportional to 21,151.22, 31,728.78 and 6,919.79

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Solution

The fourth proportional to 21,151.22, 31,728.78 and 6,919.79 is: 10,380.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,151.22 : 31,728.78 = 6,919.79 : x
  2. Step 2: Convert to fraction form
    21,151.22/31,728.78 = 6,919.79/x
  3. Step 3: Cross multiply
    21,151.22x = 31,728.78 × 6,919.79
  4. Step 4: Simplify right side
    21,151.22x = 219,556,335.91
  5. Step 5: Solve for x
    x = 219,556,335.91/21,151.22
  6. Step 6: Final answer
    x = 10,380.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.