Home / 2,816.91-3,890.80-2,111.91

Finding the Fourth Proportional to 2,816.91, 3,890.80 and 2,111.91

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Solution

The fourth proportional to 2,816.91, 3,890.80 and 2,111.91 is: 2,917.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,816.91 : 3,890.80 = 2,111.91 : x
  2. Step 2: Convert to fraction form
    2,816.91/3,890.80 = 2,111.91/x
  3. Step 3: Cross multiply
    2,816.91x = 3,890.80 × 2,111.91
  4. Step 4: Simplify right side
    2,816.91x = 8,217,007.48
  5. Step 5: Solve for x
    x = 8,217,007.48/2,816.91
  6. Step 6: Final answer
    x = 2,917.03

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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.