Home / 3,990.28-5,985.40-1,393.24

Finding the Fourth Proportional to 3,990.28, 5,985.40 and 1,393.24

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Solution

The fourth proportional to 3,990.28, 5,985.40 and 1,393.24 is: 2,089.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.28 : 5,985.40 = 1,393.24 : x
  2. Step 2: Convert to fraction form
    3,990.28/5,985.40 = 1,393.24/x
  3. Step 3: Cross multiply
    3,990.28x = 5,985.40 × 1,393.24
  4. Step 4: Simplify right side
    3,990.28x = 8,339,098.70
  5. Step 5: Solve for x
    x = 8,339,098.70/3,990.28
  6. Step 6: Final answer
    x = 2,089.85

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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.