Home / 13,720.57-20,578.70-4,359.35

Finding the Fourth Proportional to 13,720.57, 20,578.70 and 4,359.35

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Solution

The fourth proportional to 13,720.57, 20,578.70 and 4,359.35 is: 6,538.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.57 : 20,578.70 = 4,359.35 : x
  2. Step 2: Convert to fraction form
    13,720.57/20,578.70 = 4,359.35/x
  3. Step 3: Cross multiply
    13,720.57x = 20,578.70 × 4,359.35
  4. Step 4: Simplify right side
    13,720.57x = 89,709,801.84
  5. Step 5: Solve for x
    x = 89,709,801.84/13,720.57
  6. Step 6: Final answer
    x = 6,538.34

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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.