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Finding the Fourth Proportional to 255.36, 383.12 and 219.72

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Solution

The fourth proportional to 255.36, 383.12 and 219.72 is: 329.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.36 : 383.12 = 219.72 : x
  2. Step 2: Convert to fraction form
    255.36/383.12 = 219.72/x
  3. Step 3: Cross multiply
    255.36x = 383.12 × 219.72
  4. Step 4: Simplify right side
    255.36x = 84,179.13
  5. Step 5: Solve for x
    x = 84,179.13/255.36
  6. Step 6: Final answer
    x = 329.65

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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.