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Finding the Fourth Proportional to 3.78, 5.17 and 3.60

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Solution

The fourth proportional to 3.78, 5.17 and 3.60 is: 4.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.78 : 5.17 = 3.60 : x
  2. Step 2: Convert to fraction form
    3.78/5.17 = 3.60/x
  3. Step 3: Cross multiply
    3.78x = 5.17 × 3.60
  4. Step 4: Simplify right side
    3.78x = 18.59
  5. Step 5: Solve for x
    x = 18.59/3.78
  6. Step 6: Final answer
    x = 4.92

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.