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Finding the Fourth Proportional to 4.09, 5.65 and 3.12

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Solution

The fourth proportional to 4.09, 5.65 and 3.12 is: 4.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.09 : 5.65 = 3.12 : x
  2. Step 2: Convert to fraction form
    4.09/5.65 = 3.12/x
  3. Step 3: Cross multiply
    4.09x = 5.65 × 3.12
  4. Step 4: Simplify right side
    4.09x = 17.62
  5. Step 5: Solve for x
    x = 17.62/4.09
  6. Step 6: Final answer
    x = 4.31

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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.