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Finding the Fourth Proportional to 1,639.41, 2,262.43 and 940.78

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Solution

The fourth proportional to 1,639.41, 2,262.43 and 940.78 is: 1,298.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.41 : 2,262.43 = 940.78 : x
  2. Step 2: Convert to fraction form
    1,639.41/2,262.43 = 940.78/x
  3. Step 3: Cross multiply
    1,639.41x = 2,262.43 × 940.78
  4. Step 4: Simplify right side
    1,639.41x = 2,128,452.90
  5. Step 5: Solve for x
    x = 2,128,452.90/1,639.41
  6. Step 6: Final answer
    x = 1,298.31

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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.