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Finding the Fourth Proportional to 319.29, 479 and 113.86

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Solution

The fourth proportional to 319.29, 479 and 113.86 is: 170.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.29 : 479 = 113.86 : x
  2. Step 2: Convert to fraction form
    319.29/479 = 113.86/x
  3. Step 3: Cross multiply
    319.29x = 479 × 113.86
  4. Step 4: Simplify right side
    319.29x = 54,538.94
  5. Step 5: Solve for x
    x = 54,538.94/319.29
  6. Step 6: Final answer
    x = 170.81

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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.