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Finding the Fourth Proportional to 3.91, 5.39 and 2.29

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Solution

The fourth proportional to 3.91, 5.39 and 2.29 is: 3.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.91 : 5.39 = 2.29 : x
  2. Step 2: Convert to fraction form
    3.91/5.39 = 2.29/x
  3. Step 3: Cross multiply
    3.91x = 5.39 × 2.29
  4. Step 4: Simplify right side
    3.91x = 12.34
  5. Step 5: Solve for x
    x = 12.34/3.91
  6. Step 6: Final answer
    x = 3.16

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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.