Home / 13,778.85-20,665.15-3,917.91

Finding the Fourth Proportional to 13,778.85, 20,665.15 and 3,917.91

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Solution

The fourth proportional to 13,778.85, 20,665.15 and 3,917.91 is: 5,875.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,778.85 : 20,665.15 = 3,917.91 : x
  2. Step 2: Convert to fraction form
    13,778.85/20,665.15 = 3,917.91/x
  3. Step 3: Cross multiply
    13,778.85x = 20,665.15 × 3,917.91
  4. Step 4: Simplify right side
    13,778.85x = 80,964,197.84
  5. Step 5: Solve for x
    x = 80,964,197.84/13,778.85
  6. Step 6: Final answer
    x = 5,875.98

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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.