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Finding the Fourth Proportional to 911.20, 1,365.76 and 449.12

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Solution

The fourth proportional to 911.20, 1,365.76 and 449.12 is: 673.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.20 : 1,365.76 = 449.12 : x
  2. Step 2: Convert to fraction form
    911.20/1,365.76 = 449.12/x
  3. Step 3: Cross multiply
    911.20x = 1,365.76 × 449.12
  4. Step 4: Simplify right side
    911.20x = 613,390.13
  5. Step 5: Solve for x
    x = 613,390.13/911.20
  6. Step 6: Final answer
    x = 673.17

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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.