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Finding the Fourth Proportional to 936.54, 1,291.20 and 641.31

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Solution

The fourth proportional to 936.54, 1,291.20 and 641.31 is: 884.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.54 : 1,291.20 = 641.31 : x
  2. Step 2: Convert to fraction form
    936.54/1,291.20 = 641.31/x
  3. Step 3: Cross multiply
    936.54x = 1,291.20 × 641.31
  4. Step 4: Simplify right side
    936.54x = 828,059.47
  5. Step 5: Solve for x
    x = 828,059.47/936.54
  6. Step 6: Final answer
    x = 884.17

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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.