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Finding the Fourth Proportional to 319.42, 478.99 and 113.93

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Solution

The fourth proportional to 319.42, 478.99 and 113.93 is: 170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.42 : 478.99 = 113.93 : x
  2. Step 2: Convert to fraction form
    319.42/478.99 = 113.93/x
  3. Step 3: Cross multiply
    319.42x = 478.99 × 113.93
  4. Step 4: Simplify right side
    319.42x = 54,571.33
  5. Step 5: Solve for x
    x = 54,571.33/319.42
  6. Step 6: Final answer
    x = 170.85

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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.