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Finding the Fourth Proportional to 2,141.96, 3,213.08 and 661

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Solution

The fourth proportional to 2,141.96, 3,213.08 and 661 is: 991.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,141.96 : 3,213.08 = 661 : x
  2. Step 2: Convert to fraction form
    2,141.96/3,213.08 = 661/x
  3. Step 3: Cross multiply
    2,141.96x = 3,213.08 × 661
  4. Step 4: Simplify right side
    2,141.96x = 2,123,845.88
  5. Step 5: Solve for x
    x = 2,123,845.88/2,141.96
  6. Step 6: Final answer
    x = 991.54

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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.