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Finding the Fourth Proportional to 103.80, 155.69 and 38.80

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Solution

The fourth proportional to 103.80, 155.69 and 38.80 is: 58.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.80 : 155.69 = 38.80 : x
  2. Step 2: Convert to fraction form
    103.80/155.69 = 38.80/x
  3. Step 3: Cross multiply
    103.80x = 155.69 × 38.80
  4. Step 4: Simplify right side
    103.80x = 6,040.33
  5. Step 5: Solve for x
    x = 6,040.33/103.80
  6. Step 6: Final answer
    x = 58.19

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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.