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Finding the Fourth Proportional to 204.78, 307.09 and 82.99

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Solution

The fourth proportional to 204.78, 307.09 and 82.99 is: 124.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.78 : 307.09 = 82.99 : x
  2. Step 2: Convert to fraction form
    204.78/307.09 = 82.99/x
  3. Step 3: Cross multiply
    204.78x = 307.09 × 82.99
  4. Step 4: Simplify right side
    204.78x = 25,485.40
  5. Step 5: Solve for x
    x = 25,485.40/204.78
  6. Step 6: Final answer
    x = 124.45

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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.