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Finding the Fourth Proportional to 309.18, 426.70 and 198.92

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Solution

The fourth proportional to 309.18, 426.70 and 198.92 is: 274.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.18 : 426.70 = 198.92 : x
  2. Step 2: Convert to fraction form
    309.18/426.70 = 198.92/x
  3. Step 3: Cross multiply
    309.18x = 426.70 × 198.92
  4. Step 4: Simplify right side
    309.18x = 84,880.48
  5. Step 5: Solve for x
    x = 84,880.48/309.18
  6. Step 6: Final answer
    x = 274.53

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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.