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Finding the Fourth Proportional to 245.55, 338.73 and 198.98

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Solution

The fourth proportional to 245.55, 338.73 and 198.98 is: 274.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.55 : 338.73 = 198.98 : x
  2. Step 2: Convert to fraction form
    245.55/338.73 = 198.98/x
  3. Step 3: Cross multiply
    245.55x = 338.73 × 198.98
  4. Step 4: Simplify right side
    245.55x = 67,398.80
  5. Step 5: Solve for x
    x = 67,398.80/245.55
  6. Step 6: Final answer
    x = 274.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.