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Finding the Fourth Proportional to 679.15, 1,017.61 and 622.41

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Solution

The fourth proportional to 679.15, 1,017.61 and 622.41 is: 932.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.15 : 1,017.61 = 622.41 : x
  2. Step 2: Convert to fraction form
    679.15/1,017.61 = 622.41/x
  3. Step 3: Cross multiply
    679.15x = 1,017.61 × 622.41
  4. Step 4: Simplify right side
    679.15x = 633,369.08
  5. Step 5: Solve for x
    x = 633,369.08/679.15
  6. Step 6: Final answer
    x = 932.59

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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.