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Finding the Fourth Proportional to 905.44, 1,248.78 and 610.60

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Solution

The fourth proportional to 905.44, 1,248.78 and 610.60 is: 842.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.44 : 1,248.78 = 610.60 : x
  2. Step 2: Convert to fraction form
    905.44/1,248.78 = 610.60/x
  3. Step 3: Cross multiply
    905.44x = 1,248.78 × 610.60
  4. Step 4: Simplify right side
    905.44x = 762,505.07
  5. Step 5: Solve for x
    x = 762,505.07/905.44
  6. Step 6: Final answer
    x = 842.14

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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.