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Finding the Fourth Proportional to 679.19, 938.89 and 618.44

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Solution

The fourth proportional to 679.19, 938.89 and 618.44 is: 854.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.19 : 938.89 = 618.44 : x
  2. Step 2: Convert to fraction form
    679.19/938.89 = 618.44/x
  3. Step 3: Cross multiply
    679.19x = 938.89 × 618.44
  4. Step 4: Simplify right side
    679.19x = 580,643.21
  5. Step 5: Solve for x
    x = 580,643.21/679.19
  6. Step 6: Final answer
    x = 854.91

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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.