Home / 5,129.40-7,687.70-2,662.78

Finding the Fourth Proportional to 5,129.40, 7,687.70 and 2,662.78

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Solution

The fourth proportional to 5,129.40, 7,687.70 and 2,662.78 is: 3,990.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.40 : 7,687.70 = 2,662.78 : x
  2. Step 2: Convert to fraction form
    5,129.40/7,687.70 = 2,662.78/x
  3. Step 3: Cross multiply
    5,129.40x = 7,687.70 × 2,662.78
  4. Step 4: Simplify right side
    5,129.40x = 20,470,653.81
  5. Step 5: Solve for x
    x = 20,470,653.81/5,129.40
  6. Step 6: Final answer
    x = 3,990.85

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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.