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Finding the Fourth Proportional to 1,961.12, 2,939.79 and 661.88

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Solution

The fourth proportional to 1,961.12, 2,939.79 and 661.88 is: 992.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.12 : 2,939.79 = 661.88 : x
  2. Step 2: Convert to fraction form
    1,961.12/2,939.79 = 661.88/x
  3. Step 3: Cross multiply
    1,961.12x = 2,939.79 × 661.88
  4. Step 4: Simplify right side
    1,961.12x = 1,945,788.21
  5. Step 5: Solve for x
    x = 1,945,788.21/1,961.12
  6. Step 6: Final answer
    x = 992.18

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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.