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Finding the Fourth Proportional to 309.64, 427.10 and 198.94

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Solution

The fourth proportional to 309.64, 427.10 and 198.94 is: 274.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.64 : 427.10 = 198.94 : x
  2. Step 2: Convert to fraction form
    309.64/427.10 = 198.94/x
  3. Step 3: Cross multiply
    309.64x = 427.10 × 198.94
  4. Step 4: Simplify right side
    309.64x = 84,967.27
  5. Step 5: Solve for x
    x = 84,967.27/309.64
  6. Step 6: Final answer
    x = 274.41

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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.