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Finding the Fourth Proportional to 661.08, 991.67 and 198.82

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Solution

The fourth proportional to 661.08, 991.67 and 198.82 is: 298.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.08 : 991.67 = 198.82 : x
  2. Step 2: Convert to fraction form
    661.08/991.67 = 198.82/x
  3. Step 3: Cross multiply
    661.08x = 991.67 × 198.82
  4. Step 4: Simplify right side
    661.08x = 197,163.83
  5. Step 5: Solve for x
    x = 197,163.83/661.08
  6. Step 6: Final answer
    x = 298.25

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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.