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Finding the Fourth Proportional to 309.14, 426.01 and 286.70

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Solution

The fourth proportional to 309.14, 426.01 and 286.70 is: 395.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.14 : 426.01 = 286.70 : x
  2. Step 2: Convert to fraction form
    309.14/426.01 = 286.70/x
  3. Step 3: Cross multiply
    309.14x = 426.01 × 286.70
  4. Step 4: Simplify right side
    309.14x = 122,137.75
  5. Step 5: Solve for x
    x = 122,137.75/309.14
  6. Step 6: Final answer
    x = 395.09

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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.