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Finding the Fourth Proportional to 319.17, 478.79 and 113.86

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Solution

The fourth proportional to 319.17, 478.79 and 113.86 is: 170.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.17 : 478.79 = 113.86 : x
  2. Step 2: Convert to fraction form
    319.17/478.79 = 113.86/x
  3. Step 3: Cross multiply
    319.17x = 478.79 × 113.86
  4. Step 4: Simplify right side
    319.17x = 54,515.03
  5. Step 5: Solve for x
    x = 54,515.03/319.17
  6. Step 6: Final answer
    x = 170.80

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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.