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Finding the Fourth Proportional to 207.81, 311.13 and 129.48

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Solution

The fourth proportional to 207.81, 311.13 and 129.48 is: 193.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.81 : 311.13 = 129.48 : x
  2. Step 2: Convert to fraction form
    207.81/311.13 = 129.48/x
  3. Step 3: Cross multiply
    207.81x = 311.13 × 129.48
  4. Step 4: Simplify right side
    207.81x = 40,285.11
  5. Step 5: Solve for x
    x = 40,285.11/207.81
  6. Step 6: Final answer
    x = 193.86

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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.