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Finding the Fourth Proportional to 3.65, 5.05 and 3.31

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Solution

The fourth proportional to 3.65, 5.05 and 3.31 is: 4.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.65 : 5.05 = 3.31 : x
  2. Step 2: Convert to fraction form
    3.65/5.05 = 3.31/x
  3. Step 3: Cross multiply
    3.65x = 5.05 × 3.31
  4. Step 4: Simplify right side
    3.65x = 16.72
  5. Step 5: Solve for x
    x = 16.72/3.65
  6. Step 6: Final answer
    x = 4.58

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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.