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Finding the Fourth Proportional to 682.35, 1,023.81 and 317.22

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Solution

The fourth proportional to 682.35, 1,023.81 and 317.22 is: 475.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.35 : 1,023.81 = 317.22 : x
  2. Step 2: Convert to fraction form
    682.35/1,023.81 = 317.22/x
  3. Step 3: Cross multiply
    682.35x = 1,023.81 × 317.22
  4. Step 4: Simplify right side
    682.35x = 324,767.89
  5. Step 5: Solve for x
    x = 324,767.89/682.35
  6. Step 6: Final answer
    x = 475.96

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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.