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Finding the Fourth Proportional to 211.18, 316.76 and 129.90

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Solution

The fourth proportional to 211.18, 316.76 and 129.90 is: 194.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.18 : 316.76 = 129.90 : x
  2. Step 2: Convert to fraction form
    211.18/316.76 = 129.90/x
  3. Step 3: Cross multiply
    211.18x = 316.76 × 129.90
  4. Step 4: Simplify right side
    211.18x = 41,147.12
  5. Step 5: Solve for x
    x = 41,147.12/211.18
  6. Step 6: Final answer
    x = 194.84

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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.