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Finding the Fourth Proportional to 694.21, 958.09 and 428.60

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Solution

The fourth proportional to 694.21, 958.09 and 428.60 is: 591.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.21 : 958.09 = 428.60 : x
  2. Step 2: Convert to fraction form
    694.21/958.09 = 428.60/x
  3. Step 3: Cross multiply
    694.21x = 958.09 × 428.60
  4. Step 4: Simplify right side
    694.21x = 410,637.37
  5. Step 5: Solve for x
    x = 410,637.37/694.21
  6. Step 6: Final answer
    x = 591.52

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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.