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Finding the Fourth Proportional to 496.89, 685.40 and 391.82

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Solution

The fourth proportional to 496.89, 685.40 and 391.82 is: 540.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.89 : 685.40 = 391.82 : x
  2. Step 2: Convert to fraction form
    496.89/685.40 = 391.82/x
  3. Step 3: Cross multiply
    496.89x = 685.40 × 391.82
  4. Step 4: Simplify right side
    496.89x = 268,548.04
  5. Step 5: Solve for x
    x = 268,548.04/496.89
  6. Step 6: Final answer
    x = 540.46

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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.