Home / 13,720.61-20,578.51-3,857.54

Finding the Fourth Proportional to 13,720.61, 20,578.51 and 3,857.54

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Solution

The fourth proportional to 13,720.61, 20,578.51 and 3,857.54 is: 5,785.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.61 : 20,578.51 = 3,857.54 : x
  2. Step 2: Convert to fraction form
    13,720.61/20,578.51 = 3,857.54/x
  3. Step 3: Cross multiply
    13,720.61x = 20,578.51 × 3,857.54
  4. Step 4: Simplify right side
    13,720.61x = 79,382,425.47
  5. Step 5: Solve for x
    x = 79,382,425.47/13,720.61
  6. Step 6: Final answer
    x = 5,785.63

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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.