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Finding the Fourth Proportional to 207.93, 311.87 and 121.31

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Solution

The fourth proportional to 207.93, 311.87 and 121.31 is: 181.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.93 : 311.87 = 121.31 : x
  2. Step 2: Convert to fraction form
    207.93/311.87 = 121.31/x
  3. Step 3: Cross multiply
    207.93x = 311.87 × 121.31
  4. Step 4: Simplify right side
    207.93x = 37,831.64
  5. Step 5: Solve for x
    x = 37,831.64/207.93
  6. Step 6: Final answer
    x = 181.94

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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.