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Finding the Fourth Proportional to 911.25, 1,365.92 and 423.90

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Solution

The fourth proportional to 911.25, 1,365.92 and 423.90 is: 635.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.25 : 1,365.92 = 423.90 : x
  2. Step 2: Convert to fraction form
    911.25/1,365.92 = 423.90/x
  3. Step 3: Cross multiply
    911.25x = 1,365.92 × 423.90
  4. Step 4: Simplify right side
    911.25x = 579,013.49
  5. Step 5: Solve for x
    x = 579,013.49/911.25
  6. Step 6: Final answer
    x = 635.41

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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.