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Finding the Fourth Proportional to 84.43, 126.78 and 73.09

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Solution

The fourth proportional to 84.43, 126.78 and 73.09 is: 109.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.43 : 126.78 = 73.09 : x
  2. Step 2: Convert to fraction form
    84.43/126.78 = 73.09/x
  3. Step 3: Cross multiply
    84.43x = 126.78 × 73.09
  4. Step 4: Simplify right side
    84.43x = 9,266.35
  5. Step 5: Solve for x
    x = 9,266.35/84.43
  6. Step 6: Final answer
    x = 109.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.