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Finding the Fourth Proportional to 143.50, 198.03 and 91.78

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Solution

The fourth proportional to 143.50, 198.03 and 91.78 is: 126.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.50 : 198.03 = 91.78 : x
  2. Step 2: Convert to fraction form
    143.50/198.03 = 91.78/x
  3. Step 3: Cross multiply
    143.50x = 198.03 × 91.78
  4. Step 4: Simplify right side
    143.50x = 18,175.19
  5. Step 5: Solve for x
    x = 18,175.19/143.50
  6. Step 6: Final answer
    x = 126.66

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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.