Home / 2,688.28-3,711.90-2,166.76

Finding the Fourth Proportional to 2,688.28, 3,711.90 and 2,166.76

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Solution

The fourth proportional to 2,688.28, 3,711.90 and 2,166.76 is: 2,991.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.28 : 3,711.90 = 2,166.76 : x
  2. Step 2: Convert to fraction form
    2,688.28/3,711.90 = 2,166.76/x
  3. Step 3: Cross multiply
    2,688.28x = 3,711.90 × 2,166.76
  4. Step 4: Simplify right side
    2,688.28x = 8,042,796.44
  5. Step 5: Solve for x
    x = 8,042,796.44/2,688.28
  6. Step 6: Final answer
    x = 2,991.80

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Half scale
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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.