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Finding the Fourth Proportional to 131.87, 197.40 and 120.67

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Solution

The fourth proportional to 131.87, 197.40 and 120.67 is: 180.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.87 : 197.40 = 120.67 : x
  2. Step 2: Convert to fraction form
    131.87/197.40 = 120.67/x
  3. Step 3: Cross multiply
    131.87x = 197.40 × 120.67
  4. Step 4: Simplify right side
    131.87x = 23,820.26
  5. Step 5: Solve for x
    x = 23,820.26/131.87
  6. Step 6: Final answer
    x = 180.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.