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Finding the Fourth Proportional to 319.31, 478.99 and 113.83

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Solution

The fourth proportional to 319.31, 478.99 and 113.83 is: 170.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.31 : 478.99 = 113.83 : x
  2. Step 2: Convert to fraction form
    319.31/478.99 = 113.83/x
  3. Step 3: Cross multiply
    319.31x = 478.99 × 113.83
  4. Step 4: Simplify right side
    319.31x = 54,523.43
  5. Step 5: Solve for x
    x = 54,523.43/319.31
  6. Step 6: Final answer
    x = 170.75

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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.