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Finding the Fourth Proportional to 331.75, 498.84 and 318.38

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Solution

The fourth proportional to 331.75, 498.84 and 318.38 is: 478.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.75 : 498.84 = 318.38 : x
  2. Step 2: Convert to fraction form
    331.75/498.84 = 318.38/x
  3. Step 3: Cross multiply
    331.75x = 498.84 × 318.38
  4. Step 4: Simplify right side
    331.75x = 158,821.93
  5. Step 5: Solve for x
    x = 158,821.93/331.75
  6. Step 6: Final answer
    x = 478.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.