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Finding the Fourth Proportional to 212.12, 318.08 and 103.78

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Solution

The fourth proportional to 212.12, 318.08 and 103.78 is: 155.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.12 : 318.08 = 103.78 : x
  2. Step 2: Convert to fraction form
    212.12/318.08 = 103.78/x
  3. Step 3: Cross multiply
    212.12x = 318.08 × 103.78
  4. Step 4: Simplify right side
    212.12x = 33,010.42
  5. Step 5: Solve for x
    x = 33,010.42/212.12
  6. Step 6: Final answer
    x = 155.62

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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.