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Finding the Fourth Proportional to 428.00, 642.33 and 222.66

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Solution

The fourth proportional to 428.00, 642.33 and 222.66 is: 334.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.00 : 642.33 = 222.66 : x
  2. Step 2: Convert to fraction form
    428.00/642.33 = 222.66/x
  3. Step 3: Cross multiply
    428.00x = 642.33 × 222.66
  4. Step 4: Simplify right side
    428.00x = 143,021.20
  5. Step 5: Solve for x
    x = 143,021.20/428.00
  6. Step 6: Final answer
    x = 334.17

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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.