Home / 13,781.35-20,668.91-3,920.41

Finding the Fourth Proportional to 13,781.35, 20,668.91 and 3,920.41

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Solution

The fourth proportional to 13,781.35, 20,668.91 and 3,920.41 is: 5,879.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.35 : 20,668.91 = 3,920.41 : x
  2. Step 2: Convert to fraction form
    13,781.35/20,668.91 = 3,920.41/x
  3. Step 3: Cross multiply
    13,781.35x = 20,668.91 × 3,920.41
  4. Step 4: Simplify right side
    13,781.35x = 81,030,498.11
  5. Step 5: Solve for x
    x = 81,030,498.11/13,781.35
  6. Step 6: Final answer
    x = 5,879.72

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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.