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Finding the Fourth Proportional to 131.32, 180.05 and 121.84

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Solution

The fourth proportional to 131.32, 180.05 and 121.84 is: 167.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.32 : 180.05 = 121.84 : x
  2. Step 2: Convert to fraction form
    131.32/180.05 = 121.84/x
  3. Step 3: Cross multiply
    131.32x = 180.05 × 121.84
  4. Step 4: Simplify right side
    131.32x = 21,937.29
  5. Step 5: Solve for x
    x = 21,937.29/131.32
  6. Step 6: Final answer
    x = 167.05

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.