Home / 3,989.79-5,982.44-1,215.68

Finding the Fourth Proportional to 3,989.79, 5,982.44 and 1,215.68

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Solution

The fourth proportional to 3,989.79, 5,982.44 and 1,215.68 is: 1,822.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.79 : 5,982.44 = 1,215.68 : x
  2. Step 2: Convert to fraction form
    3,989.79/5,982.44 = 1,215.68/x
  3. Step 3: Cross multiply
    3,989.79x = 5,982.44 × 1,215.68
  4. Step 4: Simplify right side
    3,989.79x = 7,272,696.67
  5. Step 5: Solve for x
    x = 7,272,696.67/3,989.79
  6. Step 6: Final answer
    x = 1,822.83

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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.