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Finding the Fourth Proportional to 309.26, 426.80 and 202.98

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Solution

The fourth proportional to 309.26, 426.80 and 202.98 is: 280.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.26 : 426.80 = 202.98 : x
  2. Step 2: Convert to fraction form
    309.26/426.80 = 202.98/x
  3. Step 3: Cross multiply
    309.26x = 426.80 × 202.98
  4. Step 4: Simplify right side
    309.26x = 86,634.79
  5. Step 5: Solve for x
    x = 86,634.79/309.26
  6. Step 6: Final answer
    x = 280.13

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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.