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Finding the Fourth Proportional to 911.78, 1,365.77 and 425.24

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Solution

The fourth proportional to 911.78, 1,365.77 and 425.24 is: 636.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.78 : 1,365.77 = 425.24 : x
  2. Step 2: Convert to fraction form
    911.78/1,365.77 = 425.24/x
  3. Step 3: Cross multiply
    911.78x = 1,365.77 × 425.24
  4. Step 4: Simplify right side
    911.78x = 580,774.27
  5. Step 5: Solve for x
    x = 580,774.27/911.78
  6. Step 6: Final answer
    x = 636.97

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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.