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Finding the Fourth Proportional to 309.03, 426.33 and 221.55

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Solution

The fourth proportional to 309.03, 426.33 and 221.55 is: 305.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.03 : 426.33 = 221.55 : x
  2. Step 2: Convert to fraction form
    309.03/426.33 = 221.55/x
  3. Step 3: Cross multiply
    309.03x = 426.33 × 221.55
  4. Step 4: Simplify right side
    309.03x = 94,453.41
  5. Step 5: Solve for x
    x = 94,453.41/309.03
  6. Step 6: Final answer
    x = 305.64

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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.