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Finding the Fourth Proportional to 319.97, 479.90 and 137.31

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Solution

The fourth proportional to 319.97, 479.90 and 137.31 is: 205.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.97 : 479.90 = 137.31 : x
  2. Step 2: Convert to fraction form
    319.97/479.90 = 137.31/x
  3. Step 3: Cross multiply
    319.97x = 479.90 × 137.31
  4. Step 4: Simplify right side
    319.97x = 65,894.38
  5. Step 5: Solve for x
    x = 65,894.38/319.97
  6. Step 6: Final answer
    x = 205.94

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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.