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Finding the Fourth Proportional to 679.18, 935.28 and 665.44

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Solution

The fourth proportional to 679.18, 935.28 and 665.44 is: 916.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.18 : 935.28 = 665.44 : x
  2. Step 2: Convert to fraction form
    679.18/935.28 = 665.44/x
  3. Step 3: Cross multiply
    679.18x = 935.28 × 665.44
  4. Step 4: Simplify right side
    679.18x = 622,372.72
  5. Step 5: Solve for x
    x = 622,372.72/679.18
  6. Step 6: Final answer
    x = 916.36

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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.