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Finding the Fourth Proportional to 107.69, 161.16 and 84.68

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Solution

The fourth proportional to 107.69, 161.16 and 84.68 is: 126.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.69 : 161.16 = 84.68 : x
  2. Step 2: Convert to fraction form
    107.69/161.16 = 84.68/x
  3. Step 3: Cross multiply
    107.69x = 161.16 × 84.68
  4. Step 4: Simplify right side
    107.69x = 13,646.22
  5. Step 5: Solve for x
    x = 13,646.22/107.69
  6. Step 6: Final answer
    x = 126.72

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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.