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Finding the Fourth Proportional to 49.05, 67.69 and 28.05

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Solution

The fourth proportional to 49.05, 67.69 and 28.05 is: 38.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.05 : 67.69 = 28.05 : x
  2. Step 2: Convert to fraction form
    49.05/67.69 = 28.05/x
  3. Step 3: Cross multiply
    49.05x = 67.69 × 28.05
  4. Step 4: Simplify right side
    49.05x = 1,898.54
  5. Step 5: Solve for x
    x = 1,898.54/49.05
  6. Step 6: Final answer
    x = 38.70

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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.