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Finding the Fourth Proportional to 5.78, 7.99 and 3.97

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Solution

The fourth proportional to 5.78, 7.99 and 3.97 is: 5.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.78 : 7.99 = 3.97 : x
  2. Step 2: Convert to fraction form
    5.78/7.99 = 3.97/x
  3. Step 3: Cross multiply
    5.78x = 7.99 × 3.97
  4. Step 4: Simplify right side
    5.78x = 31.72
  5. Step 5: Solve for x
    x = 31.72/5.78
  6. Step 6: Final answer
    x = 5.49

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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.