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Finding the Fourth Proportional to 2,122.45, 3,183.76 and 661.72

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Solution

The fourth proportional to 2,122.45, 3,183.76 and 661.72 is: 992.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.45 : 3,183.76 = 661.72 : x
  2. Step 2: Convert to fraction form
    2,122.45/3,183.76 = 661.72/x
  3. Step 3: Cross multiply
    2,122.45x = 3,183.76 × 661.72
  4. Step 4: Simplify right side
    2,122.45x = 2,106,752.78
  5. Step 5: Solve for x
    x = 2,106,752.78/2,122.45
  6. Step 6: Final answer
    x = 992.60

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1.5x scale

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.