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Finding the Fourth Proportional to 120.84, 180.24 and 105.72

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Solution

The fourth proportional to 120.84, 180.24 and 105.72 is: 157.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.84 : 180.24 = 105.72 : x
  2. Step 2: Convert to fraction form
    120.84/180.24 = 105.72/x
  3. Step 3: Cross multiply
    120.84x = 180.24 × 105.72
  4. Step 4: Simplify right side
    120.84x = 19,054.97
  5. Step 5: Solve for x
    x = 19,054.97/120.84
  6. Step 6: Final answer
    x = 157.69

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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.