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Finding the Fourth Proportional to 3.89, 5.34 and 3.48

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Solution

The fourth proportional to 3.89, 5.34 and 3.48 is: 4.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.89 : 5.34 = 3.48 : x
  2. Step 2: Convert to fraction form
    3.89/5.34 = 3.48/x
  3. Step 3: Cross multiply
    3.89x = 5.34 × 3.48
  4. Step 4: Simplify right side
    3.89x = 18.58
  5. Step 5: Solve for x
    x = 18.58/3.89
  6. Step 6: Final answer
    x = 4.78

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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.