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Finding the Fourth Proportional to 211.41, 316.66 and 142.76

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Solution

The fourth proportional to 211.41, 316.66 and 142.76 is: 213.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.41 : 316.66 = 142.76 : x
  2. Step 2: Convert to fraction form
    211.41/316.66 = 142.76/x
  3. Step 3: Cross multiply
    211.41x = 316.66 × 142.76
  4. Step 4: Simplify right side
    211.41x = 45,207.08
  5. Step 5: Solve for x
    x = 45,207.08/211.41
  6. Step 6: Final answer
    x = 213.84

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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.