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Finding the Fourth Proportional to 319.54, 479.40 and 136.92

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Solution

The fourth proportional to 319.54, 479.40 and 136.92 is: 205.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.54 : 479.40 = 136.92 : x
  2. Step 2: Convert to fraction form
    319.54/479.40 = 136.92/x
  3. Step 3: Cross multiply
    319.54x = 479.40 × 136.92
  4. Step 4: Simplify right side
    319.54x = 65,639.45
  5. Step 5: Solve for x
    x = 65,639.45/319.54
  6. Step 6: Final answer
    x = 205.42

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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.