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Finding the Fourth Proportional to 683.79, 1,025.44 and 221.45

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Solution

The fourth proportional to 683.79, 1,025.44 and 221.45 is: 332.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.79 : 1,025.44 = 221.45 : x
  2. Step 2: Convert to fraction form
    683.79/1,025.44 = 221.45/x
  3. Step 3: Cross multiply
    683.79x = 1,025.44 × 221.45
  4. Step 4: Simplify right side
    683.79x = 227,082.58
  5. Step 5: Solve for x
    x = 227,082.58/683.79
  6. Step 6: Final answer
    x = 332.09

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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.