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Finding the Fourth Proportional to 212.91, 319.35 and 141.21

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Solution

The fourth proportional to 212.91, 319.35 and 141.21 is: 211.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.91 : 319.35 = 141.21 : x
  2. Step 2: Convert to fraction form
    212.91/319.35 = 141.21/x
  3. Step 3: Cross multiply
    212.91x = 319.35 × 141.21
  4. Step 4: Simplify right side
    212.91x = 45,095.41
  5. Step 5: Solve for x
    x = 45,095.41/212.91
  6. Step 6: Final answer
    x = 211.81

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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.