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Finding the Fourth Proportional to 120.03, 178.94 and 111.39

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Solution

The fourth proportional to 120.03, 178.94 and 111.39 is: 166.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.03 : 178.94 = 111.39 : x
  2. Step 2: Convert to fraction form
    120.03/178.94 = 111.39/x
  3. Step 3: Cross multiply
    120.03x = 178.94 × 111.39
  4. Step 4: Simplify right side
    120.03x = 19,931.57
  5. Step 5: Solve for x
    x = 19,931.57/120.03
  6. Step 6: Final answer
    x = 166.05

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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.