Home / 5,129.45-7,691.43-2,661.78

Finding the Fourth Proportional to 5,129.45, 7,691.43 and 2,661.78

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Solution

The fourth proportional to 5,129.45, 7,691.43 and 2,661.78 is: 3,991.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.45 : 7,691.43 = 2,661.78 : x
  2. Step 2: Convert to fraction form
    5,129.45/7,691.43 = 2,661.78/x
  3. Step 3: Cross multiply
    5,129.45x = 7,691.43 × 2,661.78
  4. Step 4: Simplify right side
    5,129.45x = 20,472,894.55
  5. Step 5: Solve for x
    x = 20,472,894.55/5,129.45
  6. Step 6: Final answer
    x = 3,991.25

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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.