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Finding the Fourth Proportional to 679.89, 1,018.92 and 371.28

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Solution

The fourth proportional to 679.89, 1,018.92 and 371.28 is: 556.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.89 : 1,018.92 = 371.28 : x
  2. Step 2: Convert to fraction form
    679.89/1,018.92 = 371.28/x
  3. Step 3: Cross multiply
    679.89x = 1,018.92 × 371.28
  4. Step 4: Simplify right side
    679.89x = 378,297.67
  5. Step 5: Solve for x
    x = 378,297.67/679.89
  6. Step 6: Final answer
    x = 556.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.