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Finding the Fourth Proportional to 204.85, 307.28 and 74.87

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Solution

The fourth proportional to 204.85, 307.28 and 74.87 is: 112.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.85 : 307.28 = 74.87 : x
  2. Step 2: Convert to fraction form
    204.85/307.28 = 74.87/x
  3. Step 3: Cross multiply
    204.85x = 307.28 × 74.87
  4. Step 4: Simplify right side
    204.85x = 23,006.05
  5. Step 5: Solve for x
    x = 23,006.05/204.85
  6. Step 6: Final answer
    x = 112.31

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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.