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Finding the Fourth Proportional to 1,679.26, 2,517.38 and 639.06

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Solution

The fourth proportional to 1,679.26, 2,517.38 and 639.06 is: 958.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.26 : 2,517.38 = 639.06 : x
  2. Step 2: Convert to fraction form
    1,679.26/2,517.38 = 639.06/x
  3. Step 3: Cross multiply
    1,679.26x = 2,517.38 × 639.06
  4. Step 4: Simplify right side
    1,679.26x = 1,608,756.86
  5. Step 5: Solve for x
    x = 1,608,756.86/1,679.26
  6. Step 6: Final answer
    x = 958.02

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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.