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Finding the Fourth Proportional to 120.16, 164.84 and 112.80

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Solution

The fourth proportional to 120.16, 164.84 and 112.80 is: 154.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.16 : 164.84 = 112.80 : x
  2. Step 2: Convert to fraction form
    120.16/164.84 = 112.80/x
  3. Step 3: Cross multiply
    120.16x = 164.84 × 112.80
  4. Step 4: Simplify right side
    120.16x = 18,593.95
  5. Step 5: Solve for x
    x = 18,593.95/120.16
  6. Step 6: Final answer
    x = 154.74

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.