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Finding the Fourth Proportional to 212.66, 319.21 and 143.04

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Solution

The fourth proportional to 212.66, 319.21 and 143.04 is: 214.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.66 : 319.21 = 143.04 : x
  2. Step 2: Convert to fraction form
    212.66/319.21 = 143.04/x
  3. Step 3: Cross multiply
    212.66x = 319.21 × 143.04
  4. Step 4: Simplify right side
    212.66x = 45,659.80
  5. Step 5: Solve for x
    x = 45,659.80/212.66
  6. Step 6: Final answer
    x = 214.71

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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.