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Finding the Fourth Proportional to 679.57, 937.94 and 396.18

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Solution

The fourth proportional to 679.57, 937.94 and 396.18 is: 546.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.57 : 937.94 = 396.18 : x
  2. Step 2: Convert to fraction form
    679.57/937.94 = 396.18/x
  3. Step 3: Cross multiply
    679.57x = 937.94 × 396.18
  4. Step 4: Simplify right side
    679.57x = 371,586.40
  5. Step 5: Solve for x
    x = 371,586.40/679.57
  6. Step 6: Final answer
    x = 546.80

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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.