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Finding the Fourth Proportional to 319.70, 479.85 and 211.56

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Solution

The fourth proportional to 319.70, 479.85 and 211.56 is: 317.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.70 : 479.85 = 211.56 : x
  2. Step 2: Convert to fraction form
    319.70/479.85 = 211.56/x
  3. Step 3: Cross multiply
    319.70x = 479.85 × 211.56
  4. Step 4: Simplify right side
    319.70x = 101,517.07
  5. Step 5: Solve for x
    x = 101,517.07/319.70
  6. Step 6: Final answer
    x = 317.54

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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.