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Finding the Fourth Proportional to 194.40, 268.20 and 120.72

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Solution

The fourth proportional to 194.40, 268.20 and 120.72 is: 166.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.40 : 268.20 = 120.72 : x
  2. Step 2: Convert to fraction form
    194.40/268.20 = 120.72/x
  3. Step 3: Cross multiply
    194.40x = 268.20 × 120.72
  4. Step 4: Simplify right side
    194.40x = 32,377.10
  5. Step 5: Solve for x
    x = 32,377.10/194.40
  6. Step 6: Final answer
    x = 166.55

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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.