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Finding the Fourth Proportional to 131.05, 180.79 and 121.79

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Solution

The fourth proportional to 131.05, 180.79 and 121.79 is: 168.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.05 : 180.79 = 121.79 : x
  2. Step 2: Convert to fraction form
    131.05/180.79 = 121.79/x
  3. Step 3: Cross multiply
    131.05x = 180.79 × 121.79
  4. Step 4: Simplify right side
    131.05x = 22,018.41
  5. Step 5: Solve for x
    x = 22,018.41/131.05
  6. Step 6: Final answer
    x = 168.02

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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.