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Finding the Fourth Proportional to 936.65, 1,291.92 and 641.54

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Solution

The fourth proportional to 936.65, 1,291.92 and 641.54 is: 884.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.65 : 1,291.92 = 641.54 : x
  2. Step 2: Convert to fraction form
    936.65/1,291.92 = 641.54/x
  3. Step 3: Cross multiply
    936.65x = 1,291.92 × 641.54
  4. Step 4: Simplify right side
    936.65x = 828,811.90
  5. Step 5: Solve for x
    x = 828,811.90/936.65
  6. Step 6: Final answer
    x = 884.87

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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.