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Finding the Fourth Proportional to 329.12, 493.80 and 112.72

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Solution

The fourth proportional to 329.12, 493.80 and 112.72 is: 169.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.12 : 493.80 = 112.72 : x
  2. Step 2: Convert to fraction form
    329.12/493.80 = 112.72/x
  3. Step 3: Cross multiply
    329.12x = 493.80 × 112.72
  4. Step 4: Simplify right side
    329.12x = 55,661.14
  5. Step 5: Solve for x
    x = 55,661.14/329.12
  6. Step 6: Final answer
    x = 169.12

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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.