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Finding the Fourth Proportional to 661.19, 911.38 and 448.44

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Solution

The fourth proportional to 661.19, 911.38 and 448.44 is: 618.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.19 : 911.38 = 448.44 : x
  2. Step 2: Convert to fraction form
    661.19/911.38 = 448.44/x
  3. Step 3: Cross multiply
    661.19x = 911.38 × 448.44
  4. Step 4: Simplify right side
    661.19x = 408,694.69
  5. Step 5: Solve for x
    x = 408,694.69/661.19
  6. Step 6: Final answer
    x = 618.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.