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Finding the Fourth Proportional to 319.91, 479.96 and 103.49

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Solution

The fourth proportional to 319.91, 479.96 and 103.49 is: 155.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.91 : 479.96 = 103.49 : x
  2. Step 2: Convert to fraction form
    319.91/479.96 = 103.49/x
  3. Step 3: Cross multiply
    319.91x = 479.96 × 103.49
  4. Step 4: Simplify right side
    319.91x = 49,671.06
  5. Step 5: Solve for x
    x = 49,671.06/319.91
  6. Step 6: Final answer
    x = 155.27

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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.