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Finding the Fourth Proportional to 850.67, 1,173.97 and 640.47

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Solution

The fourth proportional to 850.67, 1,173.97 and 640.47 is: 883.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.67 : 1,173.97 = 640.47 : x
  2. Step 2: Convert to fraction form
    850.67/1,173.97 = 640.47/x
  3. Step 3: Cross multiply
    850.67x = 1,173.97 × 640.47
  4. Step 4: Simplify right side
    850.67x = 751,892.57
  5. Step 5: Solve for x
    x = 751,892.57/850.67
  6. Step 6: Final answer
    x = 883.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.