Home / 13,720.36-20,581.75-3,859.72

Finding the Fourth Proportional to 13,720.36, 20,581.75 and 3,859.72

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Solution

The fourth proportional to 13,720.36, 20,581.75 and 3,859.72 is: 5,789.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.36 : 20,581.75 = 3,859.72 : x
  2. Step 2: Convert to fraction form
    13,720.36/20,581.75 = 3,859.72/x
  3. Step 3: Cross multiply
    13,720.36x = 20,581.75 × 3,859.72
  4. Step 4: Simplify right side
    13,720.36x = 79,439,792.11
  5. Step 5: Solve for x
    x = 79,439,792.11/13,720.36
  6. Step 6: Final answer
    x = 5,789.92

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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.