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Finding the Fourth Proportional to 3.25, 4.86 and 3.15

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Solution

The fourth proportional to 3.25, 4.86 and 3.15 is: 4.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.25 : 4.86 = 3.15 : x
  2. Step 2: Convert to fraction form
    3.25/4.86 = 3.15/x
  3. Step 3: Cross multiply
    3.25x = 4.86 × 3.15
  4. Step 4: Simplify right side
    3.25x = 15.31
  5. Step 5: Solve for x
    x = 15.31/3.25
  6. Step 6: Final answer
    x = 4.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.