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Finding the Fourth Proportional to 644.78, 889.89 and 477.02

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Solution

The fourth proportional to 644.78, 889.89 and 477.02 is: 658.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.78 : 889.89 = 477.02 : x
  2. Step 2: Convert to fraction form
    644.78/889.89 = 477.02/x
  3. Step 3: Cross multiply
    644.78x = 889.89 × 477.02
  4. Step 4: Simplify right side
    644.78x = 424,495.33
  5. Step 5: Solve for x
    x = 424,495.33/644.78
  6. Step 6: Final answer
    x = 658.36

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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.