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Finding the Fourth Proportional to 643.92, 889.03 and 423.25

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Solution

The fourth proportional to 643.92, 889.03 and 423.25 is: 584.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.92 : 889.03 = 423.25 : x
  2. Step 2: Convert to fraction form
    643.92/889.03 = 423.25/x
  3. Step 3: Cross multiply
    643.92x = 889.03 × 423.25
  4. Step 4: Simplify right side
    643.92x = 376,280.37
  5. Step 5: Solve for x
    x = 376,280.37/643.92
  6. Step 6: Final answer
    x = 584.35

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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.