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Finding the Fourth Proportional to 661.23, 991.68 and 331.83

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Solution

The fourth proportional to 661.23, 991.68 and 331.83 is: 497.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.23 : 991.68 = 331.83 : x
  2. Step 2: Convert to fraction form
    661.23/991.68 = 331.83/x
  3. Step 3: Cross multiply
    661.23x = 991.68 × 331.83
  4. Step 4: Simplify right side
    661.23x = 329,067.93
  5. Step 5: Solve for x
    x = 329,067.93/661.23
  6. Step 6: Final answer
    x = 497.66

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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.