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Finding the Fourth Proportional to 203.86, 305.79 and 82.13

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Solution

The fourth proportional to 203.86, 305.79 and 82.13 is: 123.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.86 : 305.79 = 82.13 : x
  2. Step 2: Convert to fraction form
    203.86/305.79 = 82.13/x
  3. Step 3: Cross multiply
    203.86x = 305.79 × 82.13
  4. Step 4: Simplify right side
    203.86x = 25,113.00
  5. Step 5: Solve for x
    x = 25,113.00/203.86
  6. Step 6: Final answer
    x = 123.19

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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.