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Finding the Fourth Proportional to 120.16, 180.94 and 105.12

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Solution

The fourth proportional to 120.16, 180.94 and 105.12 is: 158.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.16 : 180.94 = 105.12 : x
  2. Step 2: Convert to fraction form
    120.16/180.94 = 105.12/x
  3. Step 3: Cross multiply
    120.16x = 180.94 × 105.12
  4. Step 4: Simplify right side
    120.16x = 19,020.41
  5. Step 5: Solve for x
    x = 19,020.41/120.16
  6. Step 6: Final answer
    x = 158.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.