Home / 20,781.75-31,163.58-11,418.96

Finding the Fourth Proportional to 20,781.75, 31,163.58 and 11,418.96

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Solution

The fourth proportional to 20,781.75, 31,163.58 and 11,418.96 is: 17,123.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.75 : 31,163.58 = 11,418.96 : x
  2. Step 2: Convert to fraction form
    20,781.75/31,163.58 = 11,418.96/x
  3. Step 3: Cross multiply
    20,781.75x = 31,163.58 × 11,418.96
  4. Step 4: Simplify right side
    20,781.75x = 355,855,673.48
  5. Step 5: Solve for x
    x = 355,855,673.48/20,781.75
  6. Step 6: Final answer
    x = 17,123.47

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1.5x scale

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.