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Finding the Fourth Proportional to 143.96, 198.30 and 100.22

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Solution

The fourth proportional to 143.96, 198.30 and 100.22 is: 138.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.96 : 198.30 = 100.22 : x
  2. Step 2: Convert to fraction form
    143.96/198.30 = 100.22/x
  3. Step 3: Cross multiply
    143.96x = 198.30 × 100.22
  4. Step 4: Simplify right side
    143.96x = 19,873.63
  5. Step 5: Solve for x
    x = 19,873.63/143.96
  6. Step 6: Final answer
    x = 138.05

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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.