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Finding the Fourth Proportional to 660.14, 990.39 and 197.92

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Solution

The fourth proportional to 660.14, 990.39 and 197.92 is: 296.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.14 : 990.39 = 197.92 : x
  2. Step 2: Convert to fraction form
    660.14/990.39 = 197.92/x
  3. Step 3: Cross multiply
    660.14x = 990.39 × 197.92
  4. Step 4: Simplify right side
    660.14x = 196,017.99
  5. Step 5: Solve for x
    x = 196,017.99/660.14
  6. Step 6: Final answer
    x = 296.93

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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.