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Finding the Fourth Proportional to 679.75, 1,019.74 and 217.54

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Solution

The fourth proportional to 679.75, 1,019.74 and 217.54 is: 326.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.75 : 1,019.74 = 217.54 : x
  2. Step 2: Convert to fraction form
    679.75/1,019.74 = 217.54/x
  3. Step 3: Cross multiply
    679.75x = 1,019.74 × 217.54
  4. Step 4: Simplify right side
    679.75x = 221,834.24
  5. Step 5: Solve for x
    x = 221,834.24/679.75
  6. Step 6: Final answer
    x = 326.35

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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.