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Finding the Fourth Proportional to 661.65, 993.08 and 445.38

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Solution

The fourth proportional to 661.65, 993.08 and 445.38 is: 668.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.65 : 993.08 = 445.38 : x
  2. Step 2: Convert to fraction form
    661.65/993.08 = 445.38/x
  3. Step 3: Cross multiply
    661.65x = 993.08 × 445.38
  4. Step 4: Simplify right side
    661.65x = 442,297.97
  5. Step 5: Solve for x
    x = 442,297.97/661.65
  6. Step 6: Final answer
    x = 668.48

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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.