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Finding the Fourth Proportional to 13,779, 20,668.41 and 3,918.24

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Solution

The fourth proportional to 13,779, 20,668.41 and 3,918.24 is: 5,877.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,779 : 20,668.41 = 3,918.24 : x
  2. Step 2: Convert to fraction form
    13,779/20,668.41 = 3,918.24/x
  3. Step 3: Cross multiply
    13,779x = 20,668.41 × 3,918.24
  4. Step 4: Simplify right side
    13,779x = 80,983,790.80
  5. Step 5: Solve for x
    x = 80,983,790.80/13,779
  6. Step 6: Final answer
    x = 5,877.33

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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.