Home / 13,780.85-20,668.16-3,919.91

Finding the Fourth Proportional to 13,780.85, 20,668.16 and 3,919.91

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Solution

The fourth proportional to 13,780.85, 20,668.16 and 3,919.91 is: 5,878.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.85 : 20,668.16 = 3,919.91 : x
  2. Step 2: Convert to fraction form
    13,780.85/20,668.16 = 3,919.91/x
  3. Step 3: Cross multiply
    13,780.85x = 20,668.16 × 3,919.91
  4. Step 4: Simplify right side
    13,780.85x = 81,017,233.52
  5. Step 5: Solve for x
    x = 81,017,233.52/13,780.85
  6. Step 6: Final answer
    x = 5,878.97

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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.