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Finding the Fourth Proportional to 644.81, 889.61 and 423.89

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Solution

The fourth proportional to 644.81, 889.61 and 423.89 is: 584.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.81 : 889.61 = 423.89 : x
  2. Step 2: Convert to fraction form
    644.81/889.61 = 423.89/x
  3. Step 3: Cross multiply
    644.81x = 889.61 × 423.89
  4. Step 4: Simplify right side
    644.81x = 377,090.22
  5. Step 5: Solve for x
    x = 377,090.22/644.81
  6. Step 6: Final answer
    x = 584.81

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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.