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Finding the Fourth Proportional to 120.13, 179.39 and 102.81

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Solution

The fourth proportional to 120.13, 179.39 and 102.81 is: 153.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.13 : 179.39 = 102.81 : x
  2. Step 2: Convert to fraction form
    120.13/179.39 = 102.81/x
  3. Step 3: Cross multiply
    120.13x = 179.39 × 102.81
  4. Step 4: Simplify right side
    120.13x = 18,443.09
  5. Step 5: Solve for x
    x = 18,443.09/120.13
  6. Step 6: Final answer
    x = 153.53

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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.