Home / 3,939.75-5,431.12-2,818.75

Finding the Fourth Proportional to 3,939.75, 5,431.12 and 2,818.75

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Solution

The fourth proportional to 3,939.75, 5,431.12 and 2,818.75 is: 3,885.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.75 : 5,431.12 = 2,818.75 : x
  2. Step 2: Convert to fraction form
    3,939.75/5,431.12 = 2,818.75/x
  3. Step 3: Cross multiply
    3,939.75x = 5,431.12 × 2,818.75
  4. Step 4: Simplify right side
    3,939.75x = 15,308,969.50
  5. Step 5: Solve for x
    x = 15,308,969.50/3,939.75
  6. Step 6: Final answer
    x = 3,885.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.