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Finding the Fourth Proportional to 319.89, 480.08 and 137.42

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Solution

The fourth proportional to 319.89, 480.08 and 137.42 is: 206.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.89 : 480.08 = 137.42 : x
  2. Step 2: Convert to fraction form
    319.89/480.08 = 137.42/x
  3. Step 3: Cross multiply
    319.89x = 480.08 × 137.42
  4. Step 4: Simplify right side
    319.89x = 65,970.54
  5. Step 5: Solve for x
    x = 65,970.54/319.89
  6. Step 6: Final answer
    x = 206.23

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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.