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Finding the Fourth Proportional to 131.36, 181.20 and 87.11

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Solution

The fourth proportional to 131.36, 181.20 and 87.11 is: 120.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.36 : 181.20 = 87.11 : x
  2. Step 2: Convert to fraction form
    131.36/181.20 = 87.11/x
  3. Step 3: Cross multiply
    131.36x = 181.20 × 87.11
  4. Step 4: Simplify right side
    131.36x = 15,783.43
  5. Step 5: Solve for x
    x = 15,783.43/131.36
  6. Step 6: Final answer
    x = 120.15

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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.