Home / 20,745.85-31,118.72-5,163.47

Finding the Fourth Proportional to 20,745.85, 31,118.72 and 5,163.47

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Solution

The fourth proportional to 20,745.85, 31,118.72 and 5,163.47 is: 7,745.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,745.85 : 31,118.72 = 5,163.47 : x
  2. Step 2: Convert to fraction form
    20,745.85/31,118.72 = 5,163.47/x
  3. Step 3: Cross multiply
    20,745.85x = 31,118.72 × 5,163.47
  4. Step 4: Simplify right side
    20,745.85x = 160,680,551.34
  5. Step 5: Solve for x
    x = 160,680,551.34/20,745.85
  6. Step 6: Final answer
    x = 7,745.19

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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.