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Finding the Fourth Proportional to 137.20, 188.85 and 131.89

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Solution

The fourth proportional to 137.20, 188.85 and 131.89 is: 181.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.20 : 188.85 = 131.89 : x
  2. Step 2: Convert to fraction form
    137.20/188.85 = 131.89/x
  3. Step 3: Cross multiply
    137.20x = 188.85 × 131.89
  4. Step 4: Simplify right side
    137.20x = 24,907.43
  5. Step 5: Solve for x
    x = 24,907.43/137.20
  6. Step 6: Final answer
    x = 181.54

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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.