Home / 3,990.36-5,985.86-1,217.28

Finding the Fourth Proportional to 3,990.36, 5,985.86 and 1,217.28

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Solution

The fourth proportional to 3,990.36, 5,985.86 and 1,217.28 is: 1,826.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.36 : 5,985.86 = 1,217.28 : x
  2. Step 2: Convert to fraction form
    3,990.36/5,985.86 = 1,217.28/x
  3. Step 3: Cross multiply
    3,990.36x = 5,985.86 × 1,217.28
  4. Step 4: Simplify right side
    3,990.36x = 7,286,467.66
  5. Step 5: Solve for x
    x = 7,286,467.66/3,990.36
  6. Step 6: Final answer
    x = 1,826.02

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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.