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Finding the Fourth Proportional to 211.20, 316.96 and 142.56

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Solution

The fourth proportional to 211.20, 316.96 and 142.56 is: 213.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.20 : 316.96 = 142.56 : x
  2. Step 2: Convert to fraction form
    211.20/316.96 = 142.56/x
  3. Step 3: Cross multiply
    211.20x = 316.96 × 142.56
  4. Step 4: Simplify right side
    211.20x = 45,185.82
  5. Step 5: Solve for x
    x = 45,185.82/211.20
  6. Step 6: Final answer
    x = 213.95

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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.