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Finding the Fourth Proportional to 211.22, 316.81 and 143.18

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Solution

The fourth proportional to 211.22, 316.81 and 143.18 is: 214.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.22 : 316.81 = 143.18 : x
  2. Step 2: Convert to fraction form
    211.22/316.81 = 143.18/x
  3. Step 3: Cross multiply
    211.22x = 316.81 × 143.18
  4. Step 4: Simplify right side
    211.22x = 45,360.86
  5. Step 5: Solve for x
    x = 45,360.86/211.22
  6. Step 6: Final answer
    x = 214.76

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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.