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Finding the Fourth Proportional to 936.20, 1,290.84 and 641.72

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Solution

The fourth proportional to 936.20, 1,290.84 and 641.72 is: 884.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.20 : 1,290.84 = 641.72 : x
  2. Step 2: Convert to fraction form
    936.20/1,290.84 = 641.72/x
  3. Step 3: Cross multiply
    936.20x = 1,290.84 × 641.72
  4. Step 4: Simplify right side
    936.20x = 828,357.84
  5. Step 5: Solve for x
    x = 828,357.84/936.20
  6. Step 6: Final answer
    x = 884.81

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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.