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Finding the Fourth Proportional to 144.94, 218.25 and 120.78

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Solution

The fourth proportional to 144.94, 218.25 and 120.78 is: 181.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.94 : 218.25 = 120.78 : x
  2. Step 2: Convert to fraction form
    144.94/218.25 = 120.78/x
  3. Step 3: Cross multiply
    144.94x = 218.25 × 120.78
  4. Step 4: Simplify right side
    144.94x = 26,360.24
  5. Step 5: Solve for x
    x = 26,360.24/144.94
  6. Step 6: Final answer
    x = 181.87

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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.