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Finding the Fourth Proportional to 208.83, 312.81 and 140.38

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Solution

The fourth proportional to 208.83, 312.81 and 140.38 is: 210.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.83 : 312.81 = 140.38 : x
  2. Step 2: Convert to fraction form
    208.83/312.81 = 140.38/x
  3. Step 3: Cross multiply
    208.83x = 312.81 × 140.38
  4. Step 4: Simplify right side
    208.83x = 43,912.27
  5. Step 5: Solve for x
    x = 43,912.27/208.83
  6. Step 6: Final answer
    x = 210.28

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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.