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Finding the Fourth Proportional to 205.40, 308.11 and 68.45

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Solution

The fourth proportional to 205.40, 308.11 and 68.45 is: 102.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.40 : 308.11 = 68.45 : x
  2. Step 2: Convert to fraction form
    205.40/308.11 = 68.45/x
  3. Step 3: Cross multiply
    205.40x = 308.11 × 68.45
  4. Step 4: Simplify right side
    205.40x = 21,090.13
  5. Step 5: Solve for x
    x = 21,090.13/205.40
  6. Step 6: Final answer
    x = 102.68

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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.