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Finding the Fourth Proportional to 2,145.62, 3,218.66 and 684.42

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Solution

The fourth proportional to 2,145.62, 3,218.66 and 684.42 is: 1,026.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.62 : 3,218.66 = 684.42 : x
  2. Step 2: Convert to fraction form
    2,145.62/3,218.66 = 684.42/x
  3. Step 3: Cross multiply
    2,145.62x = 3,218.66 × 684.42
  4. Step 4: Simplify right side
    2,145.62x = 2,202,915.28
  5. Step 5: Solve for x
    x = 2,202,915.28/2,145.62
  6. Step 6: Final answer
    x = 1,026.70

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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.