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Finding the Fourth Proportional to 125.50, 188.31 and 68.50

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Solution

The fourth proportional to 125.50, 188.31 and 68.50 is: 102.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.50 : 188.31 = 68.50 : x
  2. Step 2: Convert to fraction form
    125.50/188.31 = 68.50/x
  3. Step 3: Cross multiply
    125.50x = 188.31 × 68.50
  4. Step 4: Simplify right side
    125.50x = 12,899.24
  5. Step 5: Solve for x
    x = 12,899.24/125.50
  6. Step 6: Final answer
    x = 102.78

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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.