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Finding the Fourth Proportional to 125.78, 188.73 and 85.11

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Solution

The fourth proportional to 125.78, 188.73 and 85.11 is: 127.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.78 : 188.73 = 85.11 : x
  2. Step 2: Convert to fraction form
    125.78/188.73 = 85.11/x
  3. Step 3: Cross multiply
    125.78x = 188.73 × 85.11
  4. Step 4: Simplify right side
    125.78x = 16,063.43
  5. Step 5: Solve for x
    x = 16,063.43/125.78
  6. Step 6: Final answer
    x = 127.71

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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.