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Finding the Fourth Proportional to 644.38, 889.62 and 488.86

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Solution

The fourth proportional to 644.38, 889.62 and 488.86 is: 674.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.38 : 889.62 = 488.86 : x
  2. Step 2: Convert to fraction form
    644.38/889.62 = 488.86/x
  3. Step 3: Cross multiply
    644.38x = 889.62 × 488.86
  4. Step 4: Simplify right side
    644.38x = 434,899.63
  5. Step 5: Solve for x
    x = 434,899.63/644.38
  6. Step 6: Final answer
    x = 674.91

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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.