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Finding the Fourth Proportional to 3.98, 5.49 and 3.47

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Solution

The fourth proportional to 3.98, 5.49 and 3.47 is: 4.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.98 : 5.49 = 3.47 : x
  2. Step 2: Convert to fraction form
    3.98/5.49 = 3.47/x
  3. Step 3: Cross multiply
    3.98x = 5.49 × 3.47
  4. Step 4: Simplify right side
    3.98x = 19.02
  5. Step 5: Solve for x
    x = 19.02/3.98
  6. Step 6: Final answer
    x = 4.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.