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Finding the Fourth Proportional to 319.11, 478.57 and 113.65

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Solution

The fourth proportional to 319.11, 478.57 and 113.65 is: 170.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.11 : 478.57 = 113.65 : x
  2. Step 2: Convert to fraction form
    319.11/478.57 = 113.65/x
  3. Step 3: Cross multiply
    319.11x = 478.57 × 113.65
  4. Step 4: Simplify right side
    319.11x = 54,389.48
  5. Step 5: Solve for x
    x = 54,389.48/319.11
  6. Step 6: Final answer
    x = 170.44

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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.