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Finding the Fourth Proportional to 68.77, 103.09 and 28.16

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Solution

The fourth proportional to 68.77, 103.09 and 28.16 is: 42.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.77 : 103.09 = 28.16 : x
  2. Step 2: Convert to fraction form
    68.77/103.09 = 28.16/x
  3. Step 3: Cross multiply
    68.77x = 103.09 × 28.16
  4. Step 4: Simplify right side
    68.77x = 2,902.89
  5. Step 5: Solve for x
    x = 2,902.89/68.77
  6. Step 6: Final answer
    x = 42.21

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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.