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Finding the Fourth Proportional to 107.91, 161.90 and 30.88

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Solution

The fourth proportional to 107.91, 161.90 and 30.88 is: 46.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.91 : 161.90 = 30.88 : x
  2. Step 2: Convert to fraction form
    107.91/161.90 = 30.88/x
  3. Step 3: Cross multiply
    107.91x = 161.90 × 30.88
  4. Step 4: Simplify right side
    107.91x = 4,999.99
  5. Step 5: Solve for x
    x = 4,999.99/107.91
  6. Step 6: Final answer
    x = 46.33

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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.