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Finding the Fourth Proportional to 131, 180.90 and 87.44

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Solution

The fourth proportional to 131, 180.90 and 87.44 is: 120.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    131 : 180.90 = 87.44 : x
  2. Step 2: Convert to fraction form
    131/180.90 = 87.44/x
  3. Step 3: Cross multiply
    131x = 180.90 × 87.44
  4. Step 4: Simplify right side
    131x = 15,817.90
  5. Step 5: Solve for x
    x = 15,817.90/131
  6. Step 6: Final answer
    x = 120.75

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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.