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Finding the Fourth Proportional to 120.84, 179.97 and 120.15

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Solution

The fourth proportional to 120.84, 179.97 and 120.15 is: 178.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.84 : 179.97 = 120.15 : x
  2. Step 2: Convert to fraction form
    120.84/179.97 = 120.15/x
  3. Step 3: Cross multiply
    120.84x = 179.97 × 120.15
  4. Step 4: Simplify right side
    120.84x = 21,623.40
  5. Step 5: Solve for x
    x = 21,623.40/120.84
  6. Step 6: Final answer
    x = 178.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.