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Finding the Fourth Proportional to 68.31, 102.41 and 39.75

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Solution

The fourth proportional to 68.31, 102.41 and 39.75 is: 59.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.31 : 102.41 = 39.75 : x
  2. Step 2: Convert to fraction form
    68.31/102.41 = 39.75/x
  3. Step 3: Cross multiply
    68.31x = 102.41 × 39.75
  4. Step 4: Simplify right side
    68.31x = 4,070.60
  5. Step 5: Solve for x
    x = 4,070.60/68.31
  6. Step 6: Final answer
    x = 59.59

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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.