Home / 3,989.28-5,981.76-1,215.12

Finding the Fourth Proportional to 3,989.28, 5,981.76 and 1,215.12

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Solution

The fourth proportional to 3,989.28, 5,981.76 and 1,215.12 is: 1,822.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.28 : 5,981.76 = 1,215.12 : x
  2. Step 2: Convert to fraction form
    3,989.28/5,981.76 = 1,215.12/x
  3. Step 3: Cross multiply
    3,989.28x = 5,981.76 × 1,215.12
  4. Step 4: Simplify right side
    3,989.28x = 7,268,556.21
  5. Step 5: Solve for x
    x = 7,268,556.21/3,989.28
  6. Step 6: Final answer
    x = 1,822.02

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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.