Home / 2,121.76-2,930.96-2,107.20

Finding the Fourth Proportional to 2,121.76, 2,930.96 and 2,107.20

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Solution

The fourth proportional to 2,121.76, 2,930.96 and 2,107.20 is: 2,910.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.76 : 2,930.96 = 2,107.20 : x
  2. Step 2: Convert to fraction form
    2,121.76/2,930.96 = 2,107.20/x
  3. Step 3: Cross multiply
    2,121.76x = 2,930.96 × 2,107.20
  4. Step 4: Simplify right side
    2,121.76x = 6,176,118.91
  5. Step 5: Solve for x
    x = 6,176,118.91/2,121.76
  6. Step 6: Final answer
    x = 2,910.85

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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.