Home / 3,990.20-5,985.72-1,393.16

Finding the Fourth Proportional to 3,990.20, 5,985.72 and 1,393.16

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Solution

The fourth proportional to 3,990.20, 5,985.72 and 1,393.16 is: 2,089.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.20 : 5,985.72 = 1,393.16 : x
  2. Step 2: Convert to fraction form
    3,990.20/5,985.72 = 1,393.16/x
  3. Step 3: Cross multiply
    3,990.20x = 5,985.72 × 1,393.16
  4. Step 4: Simplify right side
    3,990.20x = 8,339,065.68
  5. Step 5: Solve for x
    x = 8,339,065.68/3,990.20
  6. Step 6: Final answer
    x = 2,089.89

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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.