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Finding the Fourth Proportional to 497.21, 686.14 and 287.38

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Solution

The fourth proportional to 497.21, 686.14 and 287.38 is: 396.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.21 : 686.14 = 287.38 : x
  2. Step 2: Convert to fraction form
    497.21/686.14 = 287.38/x
  3. Step 3: Cross multiply
    497.21x = 686.14 × 287.38
  4. Step 4: Simplify right side
    497.21x = 197,183.05
  5. Step 5: Solve for x
    x = 197,183.05/497.21
  6. Step 6: Final answer
    x = 396.58

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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.