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Finding the Fourth Proportional to 644.85, 889.05 and 423.45

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Solution

The fourth proportional to 644.85, 889.05 and 423.45 is: 583.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.85 : 889.05 = 423.45 : x
  2. Step 2: Convert to fraction form
    644.85/889.05 = 423.45/x
  3. Step 3: Cross multiply
    644.85x = 889.05 × 423.45
  4. Step 4: Simplify right side
    644.85x = 376,468.22
  5. Step 5: Solve for x
    x = 376,468.22/644.85
  6. Step 6: Final answer
    x = 583.81

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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.