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Finding the Fourth Proportional to 68.65, 103.04 and 38.21

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Solution

The fourth proportional to 68.65, 103.04 and 38.21 is: 57.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.65 : 103.04 = 38.21 : x
  2. Step 2: Convert to fraction form
    68.65/103.04 = 38.21/x
  3. Step 3: Cross multiply
    68.65x = 103.04 × 38.21
  4. Step 4: Simplify right side
    68.65x = 3,936.79
  5. Step 5: Solve for x
    x = 3,936.79/68.65
  6. Step 6: Final answer
    x = 57.35

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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.