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Finding the Fourth Proportional to 497.15, 685.90 and 331.39

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Solution

The fourth proportional to 497.15, 685.90 and 331.39 is: 457.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.15 : 685.90 = 331.39 : x
  2. Step 2: Convert to fraction form
    497.15/685.90 = 331.39/x
  3. Step 3: Cross multiply
    497.15x = 685.90 × 331.39
  4. Step 4: Simplify right side
    497.15x = 227,300.40
  5. Step 5: Solve for x
    x = 227,300.40/497.15
  6. Step 6: Final answer
    x = 457.21

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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.