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Finding the Fourth Proportional to 255.85, 353.43 and 228.21

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Solution

The fourth proportional to 255.85, 353.43 and 228.21 is: 315.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.85 : 353.43 = 228.21 : x
  2. Step 2: Convert to fraction form
    255.85/353.43 = 228.21/x
  3. Step 3: Cross multiply
    255.85x = 353.43 × 228.21
  4. Step 4: Simplify right side
    255.85x = 80,656.26
  5. Step 5: Solve for x
    x = 80,656.26/255.85
  6. Step 6: Final answer
    x = 315.25

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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.