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Finding the Fourth Proportional to 661.98, 993.15 and 229.20

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Solution

The fourth proportional to 661.98, 993.15 and 229.20 is: 343.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.98 : 993.15 = 229.20 : x
  2. Step 2: Convert to fraction form
    661.98/993.15 = 229.20/x
  3. Step 3: Cross multiply
    661.98x = 993.15 × 229.20
  4. Step 4: Simplify right side
    661.98x = 227,629.98
  5. Step 5: Solve for x
    x = 227,629.98/661.98
  6. Step 6: Final answer
    x = 343.86

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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.