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Finding the Fourth Proportional to 825.62, 1,238.62 and 679.60

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Solution

The fourth proportional to 825.62, 1,238.62 and 679.60 is: 1,019.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.62 : 1,238.62 = 679.60 : x
  2. Step 2: Convert to fraction form
    825.62/1,238.62 = 679.60/x
  3. Step 3: Cross multiply
    825.62x = 1,238.62 × 679.60
  4. Step 4: Simplify right side
    825.62x = 841,766.15
  5. Step 5: Solve for x
    x = 841,766.15/825.62
  6. Step 6: Final answer
    x = 1,019.56

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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.