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Finding the Fourth Proportional to 131.37, 181.37 and 87.78

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Solution

The fourth proportional to 131.37, 181.37 and 87.78 is: 121.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.37 : 181.37 = 87.78 : x
  2. Step 2: Convert to fraction form
    131.37/181.37 = 87.78/x
  3. Step 3: Cross multiply
    131.37x = 181.37 × 87.78
  4. Step 4: Simplify right side
    131.37x = 15,920.22
  5. Step 5: Solve for x
    x = 15,920.22/131.37
  6. Step 6: Final answer
    x = 121.19

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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.