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Finding the Fourth Proportional to 131.88, 181.97 and 76.61

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Solution

The fourth proportional to 131.88, 181.97 and 76.61 is: 105.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.88 : 181.97 = 76.61 : x
  2. Step 2: Convert to fraction form
    131.88/181.97 = 76.61/x
  3. Step 3: Cross multiply
    131.88x = 181.97 × 76.61
  4. Step 4: Simplify right side
    131.88x = 13,939.43
  5. Step 5: Solve for x
    x = 13,939.43/131.88
  6. Step 6: Final answer
    x = 105.70

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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.