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Finding the Fourth Proportional to 68.53, 102.74 and 38.12

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Solution

The fourth proportional to 68.53, 102.74 and 38.12 is: 57.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.53 : 102.74 = 38.12 : x
  2. Step 2: Convert to fraction form
    68.53/102.74 = 38.12/x
  3. Step 3: Cross multiply
    68.53x = 102.74 × 38.12
  4. Step 4: Simplify right side
    68.53x = 3,916.64
  5. Step 5: Solve for x
    x = 3,916.64/68.53
  6. Step 6: Final answer
    x = 57.15

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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.