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Finding the Fourth Proportional to 84.42, 126.31 and 50.21

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Solution

The fourth proportional to 84.42, 126.31 and 50.21 is: 75.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.42 : 126.31 = 50.21 : x
  2. Step 2: Convert to fraction form
    84.42/126.31 = 50.21/x
  3. Step 3: Cross multiply
    84.42x = 126.31 × 50.21
  4. Step 4: Simplify right side
    84.42x = 6,342.03
  5. Step 5: Solve for x
    x = 6,342.03/84.42
  6. Step 6: Final answer
    x = 75.12

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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.