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Finding the Fourth Proportional to 679.08, 1,018.62 and 216.85

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Solution

The fourth proportional to 679.08, 1,018.62 and 216.85 is: 325.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.08 : 1,018.62 = 216.85 : x
  2. Step 2: Convert to fraction form
    679.08/1,018.62 = 216.85/x
  3. Step 3: Cross multiply
    679.08x = 1,018.62 × 216.85
  4. Step 4: Simplify right side
    679.08x = 220,887.75
  5. Step 5: Solve for x
    x = 220,887.75/679.08
  6. Step 6: Final answer
    x = 325.28

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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.