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Finding the Fourth Proportional to 319.87, 479.86 and 137.16

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Solution

The fourth proportional to 319.87, 479.86 and 137.16 is: 205.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.87 : 479.86 = 137.16 : x
  2. Step 2: Convert to fraction form
    319.87/479.86 = 137.16/x
  3. Step 3: Cross multiply
    319.87x = 479.86 × 137.16
  4. Step 4: Simplify right side
    319.87x = 65,817.60
  5. Step 5: Solve for x
    x = 65,817.60/319.87
  6. Step 6: Final answer
    x = 205.76

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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.