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Finding the Fourth Proportional to 68.08, 102.09 and 42.43

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Solution

The fourth proportional to 68.08, 102.09 and 42.43 is: 63.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.08 : 102.09 = 42.43 : x
  2. Step 2: Convert to fraction form
    68.08/102.09 = 42.43/x
  3. Step 3: Cross multiply
    68.08x = 102.09 × 42.43
  4. Step 4: Simplify right side
    68.08x = 4,331.68
  5. Step 5: Solve for x
    x = 4,331.68/68.08
  6. Step 6: Final answer
    x = 63.63

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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.