Home / 3,987.12-5,980.48-1,213.73

Finding the Fourth Proportional to 3,987.12, 5,980.48 and 1,213.73

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Solution

The fourth proportional to 3,987.12, 5,980.48 and 1,213.73 is: 1,820.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.12 : 5,980.48 = 1,213.73 : x
  2. Step 2: Convert to fraction form
    3,987.12/5,980.48 = 1,213.73/x
  3. Step 3: Cross multiply
    3,987.12x = 5,980.48 × 1,213.73
  4. Step 4: Simplify right side
    3,987.12x = 7,258,717.95
  5. Step 5: Solve for x
    x = 7,258,717.95/3,987.12
  6. Step 6: Final answer
    x = 1,820.54

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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.