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Finding the Fourth Proportional to 683.84, 1,025.82 and 215.42

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Solution

The fourth proportional to 683.84, 1,025.82 and 215.42 is: 323.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.84 : 1,025.82 = 215.42 : x
  2. Step 2: Convert to fraction form
    683.84/1,025.82 = 215.42/x
  3. Step 3: Cross multiply
    683.84x = 1,025.82 × 215.42
  4. Step 4: Simplify right side
    683.84x = 220,982.14
  5. Step 5: Solve for x
    x = 220,982.14/683.84
  6. Step 6: Final answer
    x = 323.15

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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.