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Finding the Fourth Proportional to 255.49, 383.98 and 212.43

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Solution

The fourth proportional to 255.49, 383.98 and 212.43 is: 319.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.49 : 383.98 = 212.43 : x
  2. Step 2: Convert to fraction form
    255.49/383.98 = 212.43/x
  3. Step 3: Cross multiply
    255.49x = 383.98 × 212.43
  4. Step 4: Simplify right side
    255.49x = 81,568.87
  5. Step 5: Solve for x
    x = 81,568.87/255.49
  6. Step 6: Final answer
    x = 319.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.