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Finding the Fourth Proportional to 679.25, 1,018.88 and 166.25

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Solution

The fourth proportional to 679.25, 1,018.88 and 166.25 is: 249.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.25 : 1,018.88 = 166.25 : x
  2. Step 2: Convert to fraction form
    679.25/1,018.88 = 166.25/x
  3. Step 3: Cross multiply
    679.25x = 1,018.88 × 166.25
  4. Step 4: Simplify right side
    679.25x = 169,388.80
  5. Step 5: Solve for x
    x = 169,388.80/679.25
  6. Step 6: Final answer
    x = 249.38

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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.