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Finding the Fourth Proportional to 309.29, 426.74 and 211.07

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Solution

The fourth proportional to 309.29, 426.74 and 211.07 is: 291.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.29 : 426.74 = 211.07 : x
  2. Step 2: Convert to fraction form
    309.29/426.74 = 211.07/x
  3. Step 3: Cross multiply
    309.29x = 426.74 × 211.07
  4. Step 4: Simplify right side
    309.29x = 90,072.02
  5. Step 5: Solve for x
    x = 90,072.02/309.29
  6. Step 6: Final answer
    x = 291.23

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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.