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Finding the Fourth Proportional to 309.65, 426.87 and 211.23

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Solution

The fourth proportional to 309.65, 426.87 and 211.23 is: 291.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.65 : 426.87 = 211.23 : x
  2. Step 2: Convert to fraction form
    309.65/426.87 = 211.23/x
  3. Step 3: Cross multiply
    309.65x = 426.87 × 211.23
  4. Step 4: Simplify right side
    309.65x = 90,167.75
  5. Step 5: Solve for x
    x = 90,167.75/309.65
  6. Step 6: Final answer
    x = 291.20

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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.