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Finding the Fourth Proportional to 212.95, 319.43 and 68.68

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Solution

The fourth proportional to 212.95, 319.43 and 68.68 is: 103.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.95 : 319.43 = 68.68 : x
  2. Step 2: Convert to fraction form
    212.95/319.43 = 68.68/x
  3. Step 3: Cross multiply
    212.95x = 319.43 × 68.68
  4. Step 4: Simplify right side
    212.95x = 21,937.83
  5. Step 5: Solve for x
    x = 21,937.83/212.95
  6. Step 6: Final answer
    x = 103.02

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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.