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Finding the Fourth Proportional to 497.47, 686.31 and 287.62

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Solution

The fourth proportional to 497.47, 686.31 and 287.62 is: 396.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.47 : 686.31 = 287.62 : x
  2. Step 2: Convert to fraction form
    497.47/686.31 = 287.62/x
  3. Step 3: Cross multiply
    497.47x = 686.31 × 287.62
  4. Step 4: Simplify right side
    497.47x = 197,396.48
  5. Step 5: Solve for x
    x = 197,396.48/497.47
  6. Step 6: Final answer
    x = 396.80

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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.