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Finding the Fourth Proportional to 309.34, 426.22 and 221.86

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Solution

The fourth proportional to 309.34, 426.22 and 221.86 is: 305.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.34 : 426.22 = 221.86 : x
  2. Step 2: Convert to fraction form
    309.34/426.22 = 221.86/x
  3. Step 3: Cross multiply
    309.34x = 426.22 × 221.86
  4. Step 4: Simplify right side
    309.34x = 94,561.17
  5. Step 5: Solve for x
    x = 94,561.17/309.34
  6. Step 6: Final answer
    x = 305.69

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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.