Home / 2,871.36-3,961.20-1,989.24

Finding the Fourth Proportional to 2,871.36, 3,961.20 and 1,989.24

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Solution

The fourth proportional to 2,871.36, 3,961.20 and 1,989.24 is: 2,744.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,871.36 : 3,961.20 = 1,989.24 : x
  2. Step 2: Convert to fraction form
    2,871.36/3,961.20 = 1,989.24/x
  3. Step 3: Cross multiply
    2,871.36x = 3,961.20 × 1,989.24
  4. Step 4: Simplify right side
    2,871.36x = 7,879,777.49
  5. Step 5: Solve for x
    x = 7,879,777.49/2,871.36
  6. Step 6: Final answer
    x = 2,744.27

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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.