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Finding the Fourth Proportional to 107.81, 161.73 and 30.78

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Solution

The fourth proportional to 107.81, 161.73 and 30.78 is: 46.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.81 : 161.73 = 30.78 : x
  2. Step 2: Convert to fraction form
    107.81/161.73 = 30.78/x
  3. Step 3: Cross multiply
    107.81x = 161.73 × 30.78
  4. Step 4: Simplify right side
    107.81x = 4,978.05
  5. Step 5: Solve for x
    x = 4,978.05/107.81
  6. Step 6: Final answer
    x = 46.18

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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.