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Finding the Fourth Proportional to 212.67, 319.01 and 68.39

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Solution

The fourth proportional to 212.67, 319.01 and 68.39 is: 102.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.67 : 319.01 = 68.39 : x
  2. Step 2: Convert to fraction form
    212.67/319.01 = 68.39/x
  3. Step 3: Cross multiply
    212.67x = 319.01 × 68.39
  4. Step 4: Simplify right side
    212.67x = 21,815.16
  5. Step 5: Solve for x
    x = 21,815.16/212.67
  6. Step 6: Final answer
    x = 102.58

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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.