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Finding the Fourth Proportional to 2,145.78, 3,218.28 and 684.96

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Solution

The fourth proportional to 2,145.78, 3,218.28 and 684.96 is: 1,027.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.78 : 3,218.28 = 684.96 : x
  2. Step 2: Convert to fraction form
    2,145.78/3,218.28 = 684.96/x
  3. Step 3: Cross multiply
    2,145.78x = 3,218.28 × 684.96
  4. Step 4: Simplify right side
    2,145.78x = 2,204,393.07
  5. Step 5: Solve for x
    x = 2,204,393.07/2,145.78
  6. Step 6: Final answer
    x = 1,027.32

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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.