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Finding the Fourth Proportional to 50.45, 69.63 and 30.80

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Solution

The fourth proportional to 50.45, 69.63 and 30.80 is: 42.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.45 : 69.63 = 30.80 : x
  2. Step 2: Convert to fraction form
    50.45/69.63 = 30.80/x
  3. Step 3: Cross multiply
    50.45x = 69.63 × 30.80
  4. Step 4: Simplify right side
    50.45x = 2,144.26
  5. Step 5: Solve for x
    x = 2,144.26/50.45
  6. Step 6: Final answer
    x = 42.50

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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.