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Finding the Fourth Proportional to 143.91, 198.63 and 100.38

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Solution

The fourth proportional to 143.91, 198.63 and 100.38 is: 138.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.91 : 198.63 = 100.38 : x
  2. Step 2: Convert to fraction form
    143.91/198.63 = 100.38/x
  3. Step 3: Cross multiply
    143.91x = 198.63 × 100.38
  4. Step 4: Simplify right side
    143.91x = 19,938.48
  5. Step 5: Solve for x
    x = 19,938.48/143.91
  6. Step 6: Final answer
    x = 138.55

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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.