Home / 2,871.67-3,964.79-1,990.18

Finding the Fourth Proportional to 2,871.67, 3,964.79 and 1,990.18

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Solution

The fourth proportional to 2,871.67, 3,964.79 and 1,990.18 is: 2,747.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,871.67 : 3,964.79 = 1,990.18 : x
  2. Step 2: Convert to fraction form
    2,871.67/3,964.79 = 1,990.18/x
  3. Step 3: Cross multiply
    2,871.67x = 3,964.79 × 1,990.18
  4. Step 4: Simplify right side
    2,871.67x = 7,890,645.76
  5. Step 5: Solve for x
    x = 7,890,645.76/2,871.67
  6. Step 6: Final answer
    x = 2,747.76

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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.