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Finding the Fourth Proportional to 120.16, 178.97 and 118.72

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Solution

The fourth proportional to 120.16, 178.97 and 118.72 is: 176.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.16 : 178.97 = 118.72 : x
  2. Step 2: Convert to fraction form
    120.16/178.97 = 118.72/x
  3. Step 3: Cross multiply
    120.16x = 178.97 × 118.72
  4. Step 4: Simplify right side
    120.16x = 21,247.32
  5. Step 5: Solve for x
    x = 21,247.32/120.16
  6. Step 6: Final answer
    x = 176.83

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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.