Home / 2,785.18-3,839.48-2,120.87

Finding the Fourth Proportional to 2,785.18, 3,839.48 and 2,120.87

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Solution

The fourth proportional to 2,785.18, 3,839.48 and 2,120.87 is: 2,923.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,785.18 : 3,839.48 = 2,120.87 : x
  2. Step 2: Convert to fraction form
    2,785.18/3,839.48 = 2,120.87/x
  3. Step 3: Cross multiply
    2,785.18x = 3,839.48 × 2,120.87
  4. Step 4: Simplify right side
    2,785.18x = 8,143,036.94
  5. Step 5: Solve for x
    x = 8,143,036.94/2,785.18
  6. Step 6: Final answer
    x = 2,923.70

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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.