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Finding the Fourth Proportional to 143.69, 198.40 and 108.78

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Solution

The fourth proportional to 143.69, 198.40 and 108.78 is: 150.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.69 : 198.40 = 108.78 : x
  2. Step 2: Convert to fraction form
    143.69/198.40 = 108.78/x
  3. Step 3: Cross multiply
    143.69x = 198.40 × 108.78
  4. Step 4: Simplify right side
    143.69x = 21,581.95
  5. Step 5: Solve for x
    x = 21,581.95/143.69
  6. Step 6: Final answer
    x = 150.20

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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.