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Finding the Fourth Proportional to 125.80, 188.80 and 85.27

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Solution

The fourth proportional to 125.80, 188.80 and 85.27 is: 127.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.80 : 188.80 = 85.27 : x
  2. Step 2: Convert to fraction form
    125.80/188.80 = 85.27/x
  3. Step 3: Cross multiply
    125.80x = 188.80 × 85.27
  4. Step 4: Simplify right side
    125.80x = 16,098.98
  5. Step 5: Solve for x
    x = 16,098.98/125.80
  6. Step 6: Final answer
    x = 127.97

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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.