Home / 3,969.32-5,471.70-2,640.20

Finding the Fourth Proportional to 3,969.32, 5,471.70 and 2,640.20

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Solution

The fourth proportional to 3,969.32, 5,471.70 and 2,640.20 is: 3,639.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,969.32 : 5,471.70 = 2,640.20 : x
  2. Step 2: Convert to fraction form
    3,969.32/5,471.70 = 2,640.20/x
  3. Step 3: Cross multiply
    3,969.32x = 5,471.70 × 2,640.20
  4. Step 4: Simplify right side
    3,969.32x = 14,446,382.34
  5. Step 5: Solve for x
    x = 14,446,382.34/3,969.32
  6. Step 6: Final answer
    x = 3,639.51

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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.