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Finding the Fourth Proportional to 1,940.64, 2,911.08 and 642.48

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Solution

The fourth proportional to 1,940.64, 2,911.08 and 642.48 is: 963.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.64 : 2,911.08 = 642.48 : x
  2. Step 2: Convert to fraction form
    1,940.64/2,911.08 = 642.48/x
  3. Step 3: Cross multiply
    1,940.64x = 2,911.08 × 642.48
  4. Step 4: Simplify right side
    1,940.64x = 1,870,310.68
  5. Step 5: Solve for x
    x = 1,870,310.68/1,940.64
  6. Step 6: Final answer
    x = 963.76

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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.