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Finding the Fourth Proportional to 131.65, 181.66 and 81.87

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Solution

The fourth proportional to 131.65, 181.66 and 81.87 is: 112.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.65 : 181.66 = 81.87 : x
  2. Step 2: Convert to fraction form
    131.65/181.66 = 81.87/x
  3. Step 3: Cross multiply
    131.65x = 181.66 × 81.87
  4. Step 4: Simplify right side
    131.65x = 14,872.50
  5. Step 5: Solve for x
    x = 14,872.50/131.65
  6. Step 6: Final answer
    x = 112.97

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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.