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Finding the Fourth Proportional to 833.70, 1,252.26 and 639.60

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Solution

The fourth proportional to 833.70, 1,252.26 and 639.60 is: 960.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.70 : 1,252.26 = 639.60 : x
  2. Step 2: Convert to fraction form
    833.70/1,252.26 = 639.60/x
  3. Step 3: Cross multiply
    833.70x = 1,252.26 × 639.60
  4. Step 4: Simplify right side
    833.70x = 800,945.50
  5. Step 5: Solve for x
    x = 800,945.50/833.70
  6. Step 6: Final answer
    x = 960.71

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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.