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Finding the Fourth Proportional to 2,121.76, 3,183.18 and 660.93

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Solution

The fourth proportional to 2,121.76, 3,183.18 and 660.93 is: 991.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.76 : 3,183.18 = 660.93 : x
  2. Step 2: Convert to fraction form
    2,121.76/3,183.18 = 660.93/x
  3. Step 3: Cross multiply
    2,121.76x = 3,183.18 × 660.93
  4. Step 4: Simplify right side
    2,121.76x = 2,103,859.16
  5. Step 5: Solve for x
    x = 2,103,859.16/2,121.76
  6. Step 6: Final answer
    x = 991.56

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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.