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Finding the Fourth Proportional to 3,112.93, 4,669.89 and 921.88

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Solution

The fourth proportional to 3,112.93, 4,669.89 and 921.88 is: 1,382.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,112.93 : 4,669.89 = 921.88 : x
  2. Step 2: Convert to fraction form
    3,112.93/4,669.89 = 921.88/x
  3. Step 3: Cross multiply
    3,112.93x = 4,669.89 × 921.88
  4. Step 4: Simplify right side
    3,112.93x = 4,305,078.19
  5. Step 5: Solve for x
    x = 4,305,078.19/3,112.93
  6. Step 6: Final answer
    x = 1,382.97

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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.