Home / 21,217.68-31,782.78-12,425.94

Finding the Fourth Proportional to 21,217.68, 31,782.78 and 12,425.94

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Solution

The fourth proportional to 21,217.68, 31,782.78 and 12,425.94 is: 18,613.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,217.68 : 31,782.78 = 12,425.94 : x
  2. Step 2: Convert to fraction form
    21,217.68/31,782.78 = 12,425.94/x
  3. Step 3: Cross multiply
    21,217.68x = 31,782.78 × 12,425.94
  4. Step 4: Simplify right side
    21,217.68x = 394,930,917.31
  5. Step 5: Solve for x
    x = 394,930,917.31/21,217.68
  6. Step 6: Final answer
    x = 18,613.29

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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.