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Finding the Fourth Proportional to 74.92, 103.39 and 41.72

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Solution

The fourth proportional to 74.92, 103.39 and 41.72 is: 57.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.92 : 103.39 = 41.72 : x
  2. Step 2: Convert to fraction form
    74.92/103.39 = 41.72/x
  3. Step 3: Cross multiply
    74.92x = 103.39 × 41.72
  4. Step 4: Simplify right side
    74.92x = 4,313.22
  5. Step 5: Solve for x
    x = 4,313.22/74.92
  6. Step 6: Final answer
    x = 57.57

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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.