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Finding the Fourth Proportional to 679.88, 1,018.20 and 371.27

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Solution

The fourth proportional to 679.88, 1,018.20 and 371.27 is: 556.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.88 : 1,018.20 = 371.27 : x
  2. Step 2: Convert to fraction form
    679.88/1,018.20 = 371.27/x
  3. Step 3: Cross multiply
    679.88x = 1,018.20 × 371.27
  4. Step 4: Simplify right side
    679.88x = 378,027.11
  5. Step 5: Solve for x
    x = 378,027.11/679.88
  6. Step 6: Final answer
    x = 556.02

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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.