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Finding the Fourth Proportional to 660.53, 990.73 and 198.41

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Solution

The fourth proportional to 660.53, 990.73 and 198.41 is: 297.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.53 : 990.73 = 198.41 : x
  2. Step 2: Convert to fraction form
    660.53/990.73 = 198.41/x
  3. Step 3: Cross multiply
    660.53x = 990.73 × 198.41
  4. Step 4: Simplify right side
    660.53x = 196,569.50
  5. Step 5: Solve for x
    x = 196,569.50/660.53
  6. Step 6: Final answer
    x = 297.60

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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.