Home / 5,120.85-7,679.10-2,157.37

Finding the Fourth Proportional to 5,120.85, 7,679.10 and 2,157.37

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Solution

The fourth proportional to 5,120.85, 7,679.10 and 2,157.37 is: 3,235.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.85 : 7,679.10 = 2,157.37 : x
  2. Step 2: Convert to fraction form
    5,120.85/7,679.10 = 2,157.37/x
  3. Step 3: Cross multiply
    5,120.85x = 7,679.10 × 2,157.37
  4. Step 4: Simplify right side
    5,120.85x = 16,566,648.86
  5. Step 5: Solve for x
    x = 16,566,648.86/5,120.85
  6. Step 6: Final answer
    x = 3,235.13

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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.