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Finding the Fourth Proportional to 84.05, 126.16 and 43.49

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Solution

The fourth proportional to 84.05, 126.16 and 43.49 is: 65.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.05 : 126.16 = 43.49 : x
  2. Step 2: Convert to fraction form
    84.05/126.16 = 43.49/x
  3. Step 3: Cross multiply
    84.05x = 126.16 × 43.49
  4. Step 4: Simplify right side
    84.05x = 5,486.20
  5. Step 5: Solve for x
    x = 5,486.20/84.05
  6. Step 6: Final answer
    x = 65.27

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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.