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Finding the Fourth Proportional to 125.96, 173.75 and 81.69

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Solution

The fourth proportional to 125.96, 173.75 and 81.69 is: 112.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.96 : 173.75 = 81.69 : x
  2. Step 2: Convert to fraction form
    125.96/173.75 = 81.69/x
  3. Step 3: Cross multiply
    125.96x = 173.75 × 81.69
  4. Step 4: Simplify right side
    125.96x = 14,193.64
  5. Step 5: Solve for x
    x = 14,193.64/125.96
  6. Step 6: Final answer
    x = 112.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.