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Finding the Fourth Proportional to 681.12, 937.98 and 645.48

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Solution

The fourth proportional to 681.12, 937.98 and 645.48 is: 888.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.12 : 937.98 = 645.48 : x
  2. Step 2: Convert to fraction form
    681.12/937.98 = 645.48/x
  3. Step 3: Cross multiply
    681.12x = 937.98 × 645.48
  4. Step 4: Simplify right side
    681.12x = 605,447.33
  5. Step 5: Solve for x
    x = 605,447.33/681.12
  6. Step 6: Final answer
    x = 888.90

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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.