Home / 13,420.85-20,139.19-5,107.86

Finding the Fourth Proportional to 13,420.85, 20,139.19 and 5,107.86

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Solution

The fourth proportional to 13,420.85, 20,139.19 and 5,107.86 is: 7,664.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.85 : 20,139.19 = 5,107.86 : x
  2. Step 2: Convert to fraction form
    13,420.85/20,139.19 = 5,107.86/x
  3. Step 3: Cross multiply
    13,420.85x = 20,139.19 × 5,107.86
  4. Step 4: Simplify right side
    13,420.85x = 102,868,150.26
  5. Step 5: Solve for x
    x = 102,868,150.26/13,420.85
  6. Step 6: Final answer
    x = 7,664.80

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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.