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Finding the Fourth Proportional to 84.63, 126.81 and 54.27

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Solution

The fourth proportional to 84.63, 126.81 and 54.27 is: 81.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.63 : 126.81 = 54.27 : x
  2. Step 2: Convert to fraction form
    84.63/126.81 = 54.27/x
  3. Step 3: Cross multiply
    84.63x = 126.81 × 54.27
  4. Step 4: Simplify right side
    84.63x = 6,881.98
  5. Step 5: Solve for x
    x = 6,881.98/84.63
  6. Step 6: Final answer
    x = 81.32

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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.