Home / 3,990.28-5,986.38-1,217.00

Finding the Fourth Proportional to 3,990.28, 5,986.38 and 1,217.00

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Solution

The fourth proportional to 3,990.28, 5,986.38 and 1,217.00 is: 1,825.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.28 : 5,986.38 = 1,217.00 : x
  2. Step 2: Convert to fraction form
    3,990.28/5,986.38 = 1,217.00/x
  3. Step 3: Cross multiply
    3,990.28x = 5,986.38 × 1,217.00
  4. Step 4: Simplify right side
    3,990.28x = 7,285,394.53
  5. Step 5: Solve for x
    x = 7,285,394.53/3,990.28
  6. Step 6: Final answer
    x = 1,825.79

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.