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Finding the Fourth Proportional to 660.74, 990.80 and 198.34

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Solution

The fourth proportional to 660.74, 990.80 and 198.34 is: 297.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.74 : 990.80 = 198.34 : x
  2. Step 2: Convert to fraction form
    660.74/990.80 = 198.34/x
  3. Step 3: Cross multiply
    660.74x = 990.80 × 198.34
  4. Step 4: Simplify right side
    660.74x = 196,515.27
  5. Step 5: Solve for x
    x = 196,515.27/660.74
  6. Step 6: Final answer
    x = 297.42

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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.