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Finding the Fourth Proportional to 644.00, 888.30 and 381.96

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Solution

The fourth proportional to 644.00, 888.30 and 381.96 is: 526.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.00 : 888.30 = 381.96 : x
  2. Step 2: Convert to fraction form
    644.00/888.30 = 381.96/x
  3. Step 3: Cross multiply
    644.00x = 888.30 × 381.96
  4. Step 4: Simplify right side
    644.00x = 339,295.07
  5. Step 5: Solve for x
    x = 339,295.07/644.00
  6. Step 6: Final answer
    x = 526.86

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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.