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Finding the Fourth Proportional to 660.39, 990.52 and 198.27

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Solution

The fourth proportional to 660.39, 990.52 and 198.27 is: 297.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.39 : 990.52 = 198.27 : x
  2. Step 2: Convert to fraction form
    660.39/990.52 = 198.27/x
  3. Step 3: Cross multiply
    660.39x = 990.52 × 198.27
  4. Step 4: Simplify right side
    660.39x = 196,390.40
  5. Step 5: Solve for x
    x = 196,390.40/660.39
  6. Step 6: Final answer
    x = 297.39

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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.