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Finding the Fourth Proportional to 131.42, 181.42 and 87.74

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Solution

The fourth proportional to 131.42, 181.42 and 87.74 is: 121.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.42 : 181.42 = 87.74 : x
  2. Step 2: Convert to fraction form
    131.42/181.42 = 87.74/x
  3. Step 3: Cross multiply
    131.42x = 181.42 × 87.74
  4. Step 4: Simplify right side
    131.42x = 15,917.79
  5. Step 5: Solve for x
    x = 15,917.79/131.42
  6. Step 6: Final answer
    x = 121.12

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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.