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Finding the Fourth Proportional to 2.09, 3.15 and 2.00

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Solution

The fourth proportional to 2.09, 3.15 and 2.00 is: 3.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.09 : 3.15 = 2.00 : x
  2. Step 2: Convert to fraction form
    2.09/3.15 = 2.00/x
  3. Step 3: Cross multiply
    2.09x = 3.15 × 2.00
  4. Step 4: Simplify right side
    2.09x = 6.31
  5. Step 5: Solve for x
    x = 6.31/2.09
  6. Step 6: Final answer
    x = 3.01

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.