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Finding the Fourth Proportional to 682.21, 1,023.52 and 528.31

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Solution

The fourth proportional to 682.21, 1,023.52 and 528.31 is: 792.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.21 : 1,023.52 = 528.31 : x
  2. Step 2: Convert to fraction form
    682.21/1,023.52 = 528.31/x
  3. Step 3: Cross multiply
    682.21x = 1,023.52 × 528.31
  4. Step 4: Simplify right side
    682.21x = 540,735.85
  5. Step 5: Solve for x
    x = 540,735.85/682.21
  6. Step 6: Final answer
    x = 792.62

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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.