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Finding the Fourth Proportional to 104.94, 144.90 and 77.28

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Solution

The fourth proportional to 104.94, 144.90 and 77.28 is: 106.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.94 : 144.90 = 77.28 : x
  2. Step 2: Convert to fraction form
    104.94/144.90 = 77.28/x
  3. Step 3: Cross multiply
    104.94x = 144.90 × 77.28
  4. Step 4: Simplify right side
    104.94x = 11,197.87
  5. Step 5: Solve for x
    x = 11,197.87/104.94
  6. Step 6: Final answer
    x = 106.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.