Home / 20,771.42-28,660.18-13,215

Finding the Fourth Proportional to 20,771.42, 28,660.18 and 13,215

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Solution

The fourth proportional to 20,771.42, 28,660.18 and 13,215 is: 18,233.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,771.42 : 28,660.18 = 13,215 : x
  2. Step 2: Convert to fraction form
    20,771.42/28,660.18 = 13,215/x
  3. Step 3: Cross multiply
    20,771.42x = 28,660.18 × 13,215
  4. Step 4: Simplify right side
    20,771.42x = 378,744,278.70
  5. Step 5: Solve for x
    x = 378,744,278.70/20,771.42
  6. Step 6: Final answer
    x = 18,233.91

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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.