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Finding the Fourth Proportional to 125.43, 187.74 and 107.42

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Solution

The fourth proportional to 125.43, 187.74 and 107.42 is: 160.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.43 : 187.74 = 107.42 : x
  2. Step 2: Convert to fraction form
    125.43/187.74 = 107.42/x
  3. Step 3: Cross multiply
    125.43x = 187.74 × 107.42
  4. Step 4: Simplify right side
    125.43x = 20,166.09
  5. Step 5: Solve for x
    x = 20,166.09/125.43
  6. Step 6: Final answer
    x = 160.78

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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.