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Finding the Fourth Proportional to 104.28, 144.12 and 100.44

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Solution

The fourth proportional to 104.28, 144.12 and 100.44 is: 138.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.28 : 144.12 = 100.44 : x
  2. Step 2: Convert to fraction form
    104.28/144.12 = 100.44/x
  3. Step 3: Cross multiply
    104.28x = 144.12 × 100.44
  4. Step 4: Simplify right side
    104.28x = 14,475.41
  5. Step 5: Solve for x
    x = 14,475.41/104.28
  6. Step 6: Final answer
    x = 138.81

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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.