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Finding the Fourth Proportional to 497.25, 686.21 and 310.68

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Solution

The fourth proportional to 497.25, 686.21 and 310.68 is: 428.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.25 : 686.21 = 310.68 : x
  2. Step 2: Convert to fraction form
    497.25/686.21 = 310.68/x
  3. Step 3: Cross multiply
    497.25x = 686.21 × 310.68
  4. Step 4: Simplify right side
    497.25x = 213,190.17
  5. Step 5: Solve for x
    x = 213,190.17/497.25
  6. Step 6: Final answer
    x = 428.74

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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.