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Finding the Fourth Proportional to 682.54, 1,025.07 and 439.54

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Solution

The fourth proportional to 682.54, 1,025.07 and 439.54 is: 660.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.54 : 1,025.07 = 439.54 : x
  2. Step 2: Convert to fraction form
    682.54/1,025.07 = 439.54/x
  3. Step 3: Cross multiply
    682.54x = 1,025.07 × 439.54
  4. Step 4: Simplify right side
    682.54x = 450,559.27
  5. Step 5: Solve for x
    x = 450,559.27/682.54
  6. Step 6: Final answer
    x = 660.12

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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.