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Finding the Fourth Proportional to 849.18, 1,271.97 and 641.46

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Solution

The fourth proportional to 849.18, 1,271.97 and 641.46 is: 960.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.18 : 1,271.97 = 641.46 : x
  2. Step 2: Convert to fraction form
    849.18/1,271.97 = 641.46/x
  3. Step 3: Cross multiply
    849.18x = 1,271.97 × 641.46
  4. Step 4: Simplify right side
    849.18x = 815,917.88
  5. Step 5: Solve for x
    x = 815,917.88/849.18
  6. Step 6: Final answer
    x = 960.83

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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.