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Finding the Fourth Proportional to 2,145.68, 3,218.56 and 684.48

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Solution

The fourth proportional to 2,145.68, 3,218.56 and 684.48 is: 1,026.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.68 : 3,218.56 = 684.48 : x
  2. Step 2: Convert to fraction form
    2,145.68/3,218.56 = 684.48/x
  3. Step 3: Cross multiply
    2,145.68x = 3,218.56 × 684.48
  4. Step 4: Simplify right side
    2,145.68x = 2,203,039.95
  5. Step 5: Solve for x
    x = 2,203,039.95/2,145.68
  6. Step 6: Final answer
    x = 1,026.73

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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.