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Finding the Fourth Proportional to 2,122.08, 3,183.12 and 661.32

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Solution

The fourth proportional to 2,122.08, 3,183.12 and 661.32 is: 991.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.08 : 3,183.12 = 661.32 : x
  2. Step 2: Convert to fraction form
    2,122.08/3,183.12 = 661.32/x
  3. Step 3: Cross multiply
    2,122.08x = 3,183.12 × 661.32
  4. Step 4: Simplify right side
    2,122.08x = 2,105,060.92
  5. Step 5: Solve for x
    x = 2,105,060.92/2,122.08
  6. Step 6: Final answer
    x = 991.98

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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.