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Finding the Fourth Proportional to 850.38, 1,272.11 and 643.41

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Solution

The fourth proportional to 850.38, 1,272.11 and 643.41 is: 962.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.38 : 1,272.11 = 643.41 : x
  2. Step 2: Convert to fraction form
    850.38/1,272.11 = 643.41/x
  3. Step 3: Cross multiply
    850.38x = 1,272.11 × 643.41
  4. Step 4: Simplify right side
    850.38x = 818,485.08
  5. Step 5: Solve for x
    x = 818,485.08/850.38
  6. Step 6: Final answer
    x = 962.49

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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.