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Finding the Fourth Proportional to 204.79, 307.26 and 74.80

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Solution

The fourth proportional to 204.79, 307.26 and 74.80 is: 112.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.79 : 307.26 = 74.80 : x
  2. Step 2: Convert to fraction form
    204.79/307.26 = 74.80/x
  3. Step 3: Cross multiply
    204.79x = 307.26 × 74.80
  4. Step 4: Simplify right side
    204.79x = 22,983.05
  5. Step 5: Solve for x
    x = 22,983.05/204.79
  6. Step 6: Final answer
    x = 112.23

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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.