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Finding the Fourth Proportional to 660, 989.81 and 197.74

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Solution

The fourth proportional to 660, 989.81 and 197.74 is: 296.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    660 : 989.81 = 197.74 : x
  2. Step 2: Convert to fraction form
    660/989.81 = 197.74/x
  3. Step 3: Cross multiply
    660x = 989.81 × 197.74
  4. Step 4: Simplify right side
    660x = 195,719.09
  5. Step 5: Solve for x
    x = 195,719.09/660
  6. Step 6: Final answer
    x = 296.54

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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.