Home / 13,720.85-20,579.12-4,359.64

Finding the Fourth Proportional to 13,720.85, 20,579.12 and 4,359.64

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Solution

The fourth proportional to 13,720.85, 20,579.12 and 4,359.64 is: 6,538.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.85 : 20,579.12 = 4,359.64 : x
  2. Step 2: Convert to fraction form
    13,720.85/20,579.12 = 4,359.64/x
  3. Step 3: Cross multiply
    13,720.85x = 20,579.12 × 4,359.64
  4. Step 4: Simplify right side
    13,720.85x = 89,717,554.72
  5. Step 5: Solve for x
    x = 89,717,554.72/13,720.85
  6. Step 6: Final answer
    x = 6,538.78

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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.