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Finding the Fourth Proportional to 661.93, 993.09 and 199.72

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Solution

The fourth proportional to 661.93, 993.09 and 199.72 is: 299.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.93 : 993.09 = 199.72 : x
  2. Step 2: Convert to fraction form
    661.93/993.09 = 199.72/x
  3. Step 3: Cross multiply
    661.93x = 993.09 × 199.72
  4. Step 4: Simplify right side
    661.93x = 198,339.93
  5. Step 5: Solve for x
    x = 198,339.93/661.93
  6. Step 6: Final answer
    x = 299.64

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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.