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Finding the Fourth Proportional to 144.28, 198.88 and 100.56

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Solution

The fourth proportional to 144.28, 198.88 and 100.56 is: 138.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.28 : 198.88 = 100.56 : x
  2. Step 2: Convert to fraction form
    144.28/198.88 = 100.56/x
  3. Step 3: Cross multiply
    144.28x = 198.88 × 100.56
  4. Step 4: Simplify right side
    144.28x = 19,999.37
  5. Step 5: Solve for x
    x = 19,999.37/144.28
  6. Step 6: Final answer
    x = 138.62

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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.