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Finding the Fourth Proportional to 497.11, 685.99 and 287.28

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Solution

The fourth proportional to 497.11, 685.99 and 287.28 is: 396.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.11 : 685.99 = 287.28 : x
  2. Step 2: Convert to fraction form
    497.11/685.99 = 287.28/x
  3. Step 3: Cross multiply
    497.11x = 685.99 × 287.28
  4. Step 4: Simplify right side
    497.11x = 197,071.21
  5. Step 5: Solve for x
    x = 197,071.21/497.11
  6. Step 6: Final answer
    x = 396.43

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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.