Home / 3,838.11-5,760.31-1,989.78

Finding the Fourth Proportional to 3,838.11, 5,760.31 and 1,989.78

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Solution

The fourth proportional to 3,838.11, 5,760.31 and 1,989.78 is: 2,986.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,838.11 : 5,760.31 = 1,989.78 : x
  2. Step 2: Convert to fraction form
    3,838.11/5,760.31 = 1,989.78/x
  3. Step 3: Cross multiply
    3,838.11x = 5,760.31 × 1,989.78
  4. Step 4: Simplify right side
    3,838.11x = 11,461,749.63
  5. Step 5: Solve for x
    x = 11,461,749.63/3,838.11
  6. Step 6: Final answer
    x = 2,986.30

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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.