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Finding the Fourth Proportional to 497.05, 685.89 and 287.23

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Solution

The fourth proportional to 497.05, 685.89 and 287.23 is: 396.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.05 : 685.89 = 287.23 : x
  2. Step 2: Convert to fraction form
    497.05/685.89 = 287.23/x
  3. Step 3: Cross multiply
    497.05x = 685.89 × 287.23
  4. Step 4: Simplify right side
    497.05x = 197,007.47
  5. Step 5: Solve for x
    x = 197,007.47/497.05
  6. Step 6: Final answer
    x = 396.36

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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.