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Finding the Fourth Proportional to 319.46, 479.21 and 136.80

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Solution

The fourth proportional to 319.46, 479.21 and 136.80 is: 205.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.46 : 479.21 = 136.80 : x
  2. Step 2: Convert to fraction form
    319.46/479.21 = 136.80/x
  3. Step 3: Cross multiply
    319.46x = 479.21 × 136.80
  4. Step 4: Simplify right side
    319.46x = 65,555.24
  5. Step 5: Solve for x
    x = 65,555.24/319.46
  6. Step 6: Final answer
    x = 205.21

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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.