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Finding the Fourth Proportional to 49.09, 67.78 and 30.69

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Solution

The fourth proportional to 49.09, 67.78 and 30.69 is: 42.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.09 : 67.78 = 30.69 : x
  2. Step 2: Convert to fraction form
    49.09/67.78 = 30.69/x
  3. Step 3: Cross multiply
    49.09x = 67.78 × 30.69
  4. Step 4: Simplify right side
    49.09x = 2,080.01
  5. Step 5: Solve for x
    x = 2,080.01/49.09
  6. Step 6: Final answer
    x = 42.37

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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.