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Finding the Fourth Proportional to 107.82, 161.60 and 39.30

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Solution

The fourth proportional to 107.82, 161.60 and 39.30 is: 58.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.82 : 161.60 = 39.30 : x
  2. Step 2: Convert to fraction form
    107.82/161.60 = 39.30/x
  3. Step 3: Cross multiply
    107.82x = 161.60 × 39.30
  4. Step 4: Simplify right side
    107.82x = 6,350.88
  5. Step 5: Solve for x
    x = 6,350.88/107.82
  6. Step 6: Final answer
    x = 58.90

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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.