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Finding the Fourth Proportional to 683.91, 1,025.78 and 221.68

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Solution

The fourth proportional to 683.91, 1,025.78 and 221.68 is: 332.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.91 : 1,025.78 = 221.68 : x
  2. Step 2: Convert to fraction form
    683.91/1,025.78 = 221.68/x
  3. Step 3: Cross multiply
    683.91x = 1,025.78 × 221.68
  4. Step 4: Simplify right side
    683.91x = 227,394.91
  5. Step 5: Solve for x
    x = 227,394.91/683.91
  6. Step 6: Final answer
    x = 332.49

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1.5x scale

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.