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Finding the Fourth Proportional to 309.47, 426.83 and 211.05

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Solution

The fourth proportional to 309.47, 426.83 and 211.05 is: 291.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.47 : 426.83 = 211.05 : x
  2. Step 2: Convert to fraction form
    309.47/426.83 = 211.05/x
  3. Step 3: Cross multiply
    309.47x = 426.83 × 211.05
  4. Step 4: Simplify right side
    309.47x = 90,081.42
  5. Step 5: Solve for x
    x = 90,081.42/309.47
  6. Step 6: Final answer
    x = 291.09

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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.