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Finding the Fourth Proportional to 936.46, 1,290.94 and 641.22

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Solution

The fourth proportional to 936.46, 1,290.94 and 641.22 is: 883.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.46 : 1,290.94 = 641.22 : x
  2. Step 2: Convert to fraction form
    936.46/1,290.94 = 641.22/x
  3. Step 3: Cross multiply
    936.46x = 1,290.94 × 641.22
  4. Step 4: Simplify right side
    936.46x = 827,776.55
  5. Step 5: Solve for x
    x = 827,776.55/936.46
  6. Step 6: Final answer
    x = 883.94

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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.