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Finding the Fourth Proportional to 319.68, 479.64 and 211.92

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Solution

The fourth proportional to 319.68, 479.64 and 211.92 is: 317.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.68 : 479.64 = 211.92 : x
  2. Step 2: Convert to fraction form
    319.68/479.64 = 211.92/x
  3. Step 3: Cross multiply
    319.68x = 479.64 × 211.92
  4. Step 4: Simplify right side
    319.68x = 101,645.31
  5. Step 5: Solve for x
    x = 101,645.31/319.68
  6. Step 6: Final answer
    x = 317.96

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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.