Home / 3,990.54-5,985.91-1,217.20

Finding the Fourth Proportional to 3,990.54, 5,985.91 and 1,217.20

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Solution

The fourth proportional to 3,990.54, 5,985.91 and 1,217.20 is: 1,825.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.54 : 5,985.91 = 1,217.20 : x
  2. Step 2: Convert to fraction form
    3,990.54/5,985.91 = 1,217.20/x
  3. Step 3: Cross multiply
    3,990.54x = 5,985.91 × 1,217.20
  4. Step 4: Simplify right side
    3,990.54x = 7,286,049.65
  5. Step 5: Solve for x
    x = 7,286,049.65/3,990.54
  6. Step 6: Final answer
    x = 1,825.83

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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.