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Finding the Fourth Proportional to 255.45, 382.33 and 219.81

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Solution

The fourth proportional to 255.45, 382.33 and 219.81 is: 328.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.45 : 382.33 = 219.81 : x
  2. Step 2: Convert to fraction form
    255.45/382.33 = 219.81/x
  3. Step 3: Cross multiply
    255.45x = 382.33 × 219.81
  4. Step 4: Simplify right side
    255.45x = 84,040.51
  5. Step 5: Solve for x
    x = 84,040.51/255.45
  6. Step 6: Final answer
    x = 328.99

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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.