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Finding the Fourth Proportional to 911.05, 1,365.91 and 448.71

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Solution

The fourth proportional to 911.05, 1,365.91 and 448.71 is: 672.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.05 : 1,365.91 = 448.71 : x
  2. Step 2: Convert to fraction form
    911.05/1,365.91 = 448.71/x
  3. Step 3: Cross multiply
    911.05x = 1,365.91 × 448.71
  4. Step 4: Simplify right side
    911.05x = 612,891.23
  5. Step 5: Solve for x
    x = 612,891.23/911.05
  6. Step 6: Final answer
    x = 672.73

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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.