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Finding the Fourth Proportional to 36.79, 50.78 and 30.65

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Solution

The fourth proportional to 36.79, 50.78 and 30.65 is: 42.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.79 : 50.78 = 30.65 : x
  2. Step 2: Convert to fraction form
    36.79/50.78 = 30.65/x
  3. Step 3: Cross multiply
    36.79x = 50.78 × 30.65
  4. Step 4: Simplify right side
    36.79x = 1,556.41
  5. Step 5: Solve for x
    x = 1,556.41/36.79
  6. Step 6: Final answer
    x = 42.31

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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.