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Finding the Fourth Proportional to 309.18, 426.59 and 198.69

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Solution

The fourth proportional to 309.18, 426.59 and 198.69 is: 274.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.18 : 426.59 = 198.69 : x
  2. Step 2: Convert to fraction form
    309.18/426.59 = 198.69/x
  3. Step 3: Cross multiply
    309.18x = 426.59 × 198.69
  4. Step 4: Simplify right side
    309.18x = 84,759.66
  5. Step 5: Solve for x
    x = 84,759.66/309.18
  6. Step 6: Final answer
    x = 274.14

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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.