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Finding the Fourth Proportional to 661.03, 991.68 and 198.84

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Solution

The fourth proportional to 661.03, 991.68 and 198.84 is: 298.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.03 : 991.68 = 198.84 : x
  2. Step 2: Convert to fraction form
    661.03/991.68 = 198.84/x
  3. Step 3: Cross multiply
    661.03x = 991.68 × 198.84
  4. Step 4: Simplify right side
    661.03x = 197,185.65
  5. Step 5: Solve for x
    x = 197,185.65/661.03
  6. Step 6: Final answer
    x = 298.30

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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.