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Finding the Fourth Proportional to 74.78, 103.19 and 43.27

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Solution

The fourth proportional to 74.78, 103.19 and 43.27 is: 59.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.78 : 103.19 = 43.27 : x
  2. Step 2: Convert to fraction form
    74.78/103.19 = 43.27/x
  3. Step 3: Cross multiply
    74.78x = 103.19 × 43.27
  4. Step 4: Simplify right side
    74.78x = 4,464.56
  5. Step 5: Solve for x
    x = 4,464.56/74.78
  6. Step 6: Final answer
    x = 59.71

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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.