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Finding the Fourth Proportional to 679.08, 1,017.34 and 389.64

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Solution

The fourth proportional to 679.08, 1,017.34 and 389.64 is: 583.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.08 : 1,017.34 = 389.64 : x
  2. Step 2: Convert to fraction form
    679.08/1,017.34 = 389.64/x
  3. Step 3: Cross multiply
    679.08x = 1,017.34 × 389.64
  4. Step 4: Simplify right side
    679.08x = 396,396.36
  5. Step 5: Solve for x
    x = 396,396.36/679.08
  6. Step 6: Final answer
    x = 583.73

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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.