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Finding the Fourth Proportional to 205.01, 307.85 and 136.65

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Solution

The fourth proportional to 205.01, 307.85 and 136.65 is: 205.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.01 : 307.85 = 136.65 : x
  2. Step 2: Convert to fraction form
    205.01/307.85 = 136.65/x
  3. Step 3: Cross multiply
    205.01x = 307.85 × 136.65
  4. Step 4: Simplify right side
    205.01x = 42,067.02
  5. Step 5: Solve for x
    x = 42,067.02/205.01
  6. Step 6: Final answer
    x = 205.20

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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.