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Finding the Fourth Proportional to 661.26, 991.96 and 271.24

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Solution

The fourth proportional to 661.26, 991.96 and 271.24 is: 406.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.26 : 991.96 = 271.24 : x
  2. Step 2: Convert to fraction form
    661.26/991.96 = 271.24/x
  3. Step 3: Cross multiply
    661.26x = 991.96 × 271.24
  4. Step 4: Simplify right side
    661.26x = 269,062.67
  5. Step 5: Solve for x
    x = 269,062.67/661.26
  6. Step 6: Final answer
    x = 406.90

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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.