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Finding the Fourth Proportional to 103.91, 155.91 and 49.79

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Solution

The fourth proportional to 103.91, 155.91 and 49.79 is: 74.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.91 : 155.91 = 49.79 : x
  2. Step 2: Convert to fraction form
    103.91/155.91 = 49.79/x
  3. Step 3: Cross multiply
    103.91x = 155.91 × 49.79
  4. Step 4: Simplify right side
    103.91x = 7,762.76
  5. Step 5: Solve for x
    x = 7,762.76/103.91
  6. Step 6: Final answer
    x = 74.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.