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Finding the Fourth Proportional to 68.35, 102.40 and 42.69

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Solution

The fourth proportional to 68.35, 102.40 and 42.69 is: 63.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.35 : 102.40 = 42.69 : x
  2. Step 2: Convert to fraction form
    68.35/102.40 = 42.69/x
  3. Step 3: Cross multiply
    68.35x = 102.40 × 42.69
  4. Step 4: Simplify right side
    68.35x = 4,371.46
  5. Step 5: Solve for x
    x = 4,371.46/68.35
  6. Step 6: Final answer
    x = 63.96

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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.