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Finding the Fourth Proportional to 679.07, 936.45 and 426.80

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Solution

The fourth proportional to 679.07, 936.45 and 426.80 is: 588.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.07 : 936.45 = 426.80 : x
  2. Step 2: Convert to fraction form
    679.07/936.45 = 426.80/x
  3. Step 3: Cross multiply
    679.07x = 936.45 × 426.80
  4. Step 4: Simplify right side
    679.07x = 399,672.18
  5. Step 5: Solve for x
    x = 399,672.18/679.07
  6. Step 6: Final answer
    x = 588.56

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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.