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Finding the Fourth Proportional to 50.91, 70.26 and 28.79

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Solution

The fourth proportional to 50.91, 70.26 and 28.79 is: 39.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.91 : 70.26 = 28.79 : x
  2. Step 2: Convert to fraction form
    50.91/70.26 = 28.79/x
  3. Step 3: Cross multiply
    50.91x = 70.26 × 28.79
  4. Step 4: Simplify right side
    50.91x = 2,022.70
  5. Step 5: Solve for x
    x = 2,022.70/50.91
  6. Step 6: Final answer
    x = 39.73

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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.