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Finding the Fourth Proportional to 131.38, 181.34 and 87.84

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Solution

The fourth proportional to 131.38, 181.34 and 87.84 is: 121.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.38 : 181.34 = 87.84 : x
  2. Step 2: Convert to fraction form
    131.38/181.34 = 87.84/x
  3. Step 3: Cross multiply
    131.38x = 181.34 × 87.84
  4. Step 4: Simplify right side
    131.38x = 15,928.80
  5. Step 5: Solve for x
    x = 15,928.80/131.38
  6. Step 6: Final answer
    x = 121.24

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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.