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Finding the Fourth Proportional to 131.22, 180.72 and 120.33

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Solution

The fourth proportional to 131.22, 180.72 and 120.33 is: 165.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.22 : 180.72 = 120.33 : x
  2. Step 2: Convert to fraction form
    131.22/180.72 = 120.33/x
  3. Step 3: Cross multiply
    131.22x = 180.72 × 120.33
  4. Step 4: Simplify right side
    131.22x = 21,746.04
  5. Step 5: Solve for x
    x = 21,746.04/131.22
  6. Step 6: Final answer
    x = 165.72

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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.