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Finding the Fourth Proportional to 103.81, 155.74 and 49.70

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Solution

The fourth proportional to 103.81, 155.74 and 49.70 is: 74.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.81 : 155.74 = 49.70 : x
  2. Step 2: Convert to fraction form
    103.81/155.74 = 49.70/x
  3. Step 3: Cross multiply
    103.81x = 155.74 × 49.70
  4. Step 4: Simplify right side
    103.81x = 7,740.92
  5. Step 5: Solve for x
    x = 7,740.92/103.81
  6. Step 6: Final answer
    x = 74.57

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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.