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Finding the Fourth Proportional to 681.32, 1,015.20 and 648.26

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Solution

The fourth proportional to 681.32, 1,015.20 and 648.26 is: 965.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.32 : 1,015.20 = 648.26 : x
  2. Step 2: Convert to fraction form
    681.32/1,015.20 = 648.26/x
  3. Step 3: Cross multiply
    681.32x = 1,015.20 × 648.26
  4. Step 4: Simplify right side
    681.32x = 658,110.10
  5. Step 5: Solve for x
    x = 658,110.10/681.32
  6. Step 6: Final answer
    x = 965.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.