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Finding the Fourth Proportional to 307.88, 461.97 and 205.20

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Solution

The fourth proportional to 307.88, 461.97 and 205.20 is: 307.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.88 : 461.97 = 205.20 : x
  2. Step 2: Convert to fraction form
    307.88/461.97 = 205.20/x
  3. Step 3: Cross multiply
    307.88x = 461.97 × 205.20
  4. Step 4: Simplify right side
    307.88x = 94,796.24
  5. Step 5: Solve for x
    x = 94,796.24/307.88
  6. Step 6: Final answer
    x = 307.90

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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.