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Finding the Fourth Proportional to 255.08, 382.80 and 221.24

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Solution

The fourth proportional to 255.08, 382.80 and 221.24 is: 332.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.08 : 382.80 = 221.24 : x
  2. Step 2: Convert to fraction form
    255.08/382.80 = 221.24/x
  3. Step 3: Cross multiply
    255.08x = 382.80 × 221.24
  4. Step 4: Simplify right side
    255.08x = 84,690.67
  5. Step 5: Solve for x
    x = 84,690.67/255.08
  6. Step 6: Final answer
    x = 332.02

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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.