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Finding the Fourth Proportional to 1,960.56, 2,940.86 and 921.31

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Solution

The fourth proportional to 1,960.56, 2,940.86 and 921.31 is: 1,381.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.56 : 2,940.86 = 921.31 : x
  2. Step 2: Convert to fraction form
    1,960.56/2,940.86 = 921.31/x
  3. Step 3: Cross multiply
    1,960.56x = 2,940.86 × 921.31
  4. Step 4: Simplify right side
    1,960.56x = 2,709,438.68
  5. Step 5: Solve for x
    x = 2,709,438.68/1,960.56
  6. Step 6: Final answer
    x = 1,381.97

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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.