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Finding the Fourth Proportional to 50.75, 76.10 and 20.31

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Solution

The fourth proportional to 50.75, 76.10 and 20.31 is: 30.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.75 : 76.10 = 20.31 : x
  2. Step 2: Convert to fraction form
    50.75/76.10 = 20.31/x
  3. Step 3: Cross multiply
    50.75x = 76.10 × 20.31
  4. Step 4: Simplify right side
    50.75x = 1,545.64
  5. Step 5: Solve for x
    x = 1,545.64/50.75
  6. Step 6: Final answer
    x = 30.45

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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.