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Finding the Fourth Proportional to 120.68, 180.78 and 97.74

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Solution

The fourth proportional to 120.68, 180.78 and 97.74 is: 146.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.68 : 180.78 = 97.74 : x
  2. Step 2: Convert to fraction form
    120.68/180.78 = 97.74/x
  3. Step 3: Cross multiply
    120.68x = 180.78 × 97.74
  4. Step 4: Simplify right side
    120.68x = 17,669.44
  5. Step 5: Solve for x
    x = 17,669.44/120.68
  6. Step 6: Final answer
    x = 146.42

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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.