Home / 3,710.81-5,120.92-2,139.21

Finding the Fourth Proportional to 3,710.81, 5,120.92 and 2,139.21

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Solution

The fourth proportional to 3,710.81, 5,120.92 and 2,139.21 is: 2,952.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,710.81 : 5,120.92 = 2,139.21 : x
  2. Step 2: Convert to fraction form
    3,710.81/5,120.92 = 2,139.21/x
  3. Step 3: Cross multiply
    3,710.81x = 5,120.92 × 2,139.21
  4. Step 4: Simplify right side
    3,710.81x = 10,954,725.95
  5. Step 5: Solve for x
    x = 10,954,725.95/3,710.81
  6. Step 6: Final answer
    x = 2,952.11

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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.