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Finding the Fourth Proportional to 205.88, 307.61 and 198.70

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Solution

The fourth proportional to 205.88, 307.61 and 198.70 is: 296.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.88 : 307.61 = 198.70 : x
  2. Step 2: Convert to fraction form
    205.88/307.61 = 198.70/x
  3. Step 3: Cross multiply
    205.88x = 307.61 × 198.70
  4. Step 4: Simplify right side
    205.88x = 61,122.11
  5. Step 5: Solve for x
    x = 61,122.11/205.88
  6. Step 6: Final answer
    x = 296.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.