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Finding the Fourth Proportional to 103.69, 155.58 and 49.60

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Solution

The fourth proportional to 103.69, 155.58 and 49.60 is: 74.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.69 : 155.58 = 49.60 : x
  2. Step 2: Convert to fraction form
    103.69/155.58 = 49.60/x
  3. Step 3: Cross multiply
    103.69x = 155.58 × 49.60
  4. Step 4: Simplify right side
    103.69x = 7,716.77
  5. Step 5: Solve for x
    x = 7,716.77/103.69
  6. Step 6: Final answer
    x = 74.42

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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.