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Finding the Fourth Proportional to 660.30, 990.15 and 197.92

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Solution

The fourth proportional to 660.30, 990.15 and 197.92 is: 296.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.30 : 990.15 = 197.92 : x
  2. Step 2: Convert to fraction form
    660.30/990.15 = 197.92/x
  3. Step 3: Cross multiply
    660.30x = 990.15 × 197.92
  4. Step 4: Simplify right side
    660.30x = 195,970.49
  5. Step 5: Solve for x
    x = 195,970.49/660.30
  6. Step 6: Final answer
    x = 296.79

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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.