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Finding the Fourth Proportional to 427.86, 641.58 and 221.92

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Solution

The fourth proportional to 427.86, 641.58 and 221.92 is: 332.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.86 : 641.58 = 221.92 : x
  2. Step 2: Convert to fraction form
    427.86/641.58 = 221.92/x
  3. Step 3: Cross multiply
    427.86x = 641.58 × 221.92
  4. Step 4: Simplify right side
    427.86x = 142,379.43
  5. Step 5: Solve for x
    x = 142,379.43/427.86
  6. Step 6: Final answer
    x = 332.77

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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.