Home / 3,938.38-5,911.21-1,991.94

Finding the Fourth Proportional to 3,938.38, 5,911.21 and 1,991.94

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Solution

The fourth proportional to 3,938.38, 5,911.21 and 1,991.94 is: 2,989.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,938.38 : 5,911.21 = 1,991.94 : x
  2. Step 2: Convert to fraction form
    3,938.38/5,911.21 = 1,991.94/x
  3. Step 3: Cross multiply
    3,938.38x = 5,911.21 × 1,991.94
  4. Step 4: Simplify right side
    3,938.38x = 11,774,775.65
  5. Step 5: Solve for x
    x = 11,774,775.65/3,938.38
  6. Step 6: Final answer
    x = 2,989.75

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1.5x scale

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.