Home / 13,780.86-20,668.14-3,919.92

Finding the Fourth Proportional to 13,780.86, 20,668.14 and 3,919.92

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Solution

The fourth proportional to 13,780.86, 20,668.14 and 3,919.92 is: 5,878.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.86 : 20,668.14 = 3,919.92 : x
  2. Step 2: Convert to fraction form
    13,780.86/20,668.14 = 3,919.92/x
  3. Step 3: Cross multiply
    13,780.86x = 20,668.14 × 3,919.92
  4. Step 4: Simplify right side
    13,780.86x = 81,017,455.35
  5. Step 5: Solve for x
    x = 81,017,455.35/13,780.86
  6. Step 6: Final answer
    x = 5,878.98

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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.