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Finding the Fourth Proportional to 107.42, 161.15 and 42.42

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Solution

The fourth proportional to 107.42, 161.15 and 42.42 is: 63.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.42 : 161.15 = 42.42 : x
  2. Step 2: Convert to fraction form
    107.42/161.15 = 42.42/x
  3. Step 3: Cross multiply
    107.42x = 161.15 × 42.42
  4. Step 4: Simplify right side
    107.42x = 6,835.98
  5. Step 5: Solve for x
    x = 6,835.98/107.42
  6. Step 6: Final answer
    x = 63.64

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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.