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Finding the Fourth Proportional to 212.79, 319.23 and 104.55

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Solution

The fourth proportional to 212.79, 319.23 and 104.55 is: 156.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.79 : 319.23 = 104.55 : x
  2. Step 2: Convert to fraction form
    212.79/319.23 = 104.55/x
  3. Step 3: Cross multiply
    212.79x = 319.23 × 104.55
  4. Step 4: Simplify right side
    212.79x = 33,375.50
  5. Step 5: Solve for x
    x = 33,375.50/212.79
  6. Step 6: Final answer
    x = 156.85

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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.