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Finding the Fourth Proportional to 50.21, 69.31 and 36.40

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Solution

The fourth proportional to 50.21, 69.31 and 36.40 is: 50.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.21 : 69.31 = 36.40 : x
  2. Step 2: Convert to fraction form
    50.21/69.31 = 36.40/x
  3. Step 3: Cross multiply
    50.21x = 69.31 × 36.40
  4. Step 4: Simplify right side
    50.21x = 2,522.88
  5. Step 5: Solve for x
    x = 2,522.88/50.21
  6. Step 6: Final answer
    x = 50.25

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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.