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Finding the Fourth Proportional to 682.08, 1,023.84 and 641.76

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Solution

The fourth proportional to 682.08, 1,023.84 and 641.76 is: 963.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.08 : 1,023.84 = 641.76 : x
  2. Step 2: Convert to fraction form
    682.08/1,023.84 = 641.76/x
  3. Step 3: Cross multiply
    682.08x = 1,023.84 × 641.76
  4. Step 4: Simplify right side
    682.08x = 657,059.56
  5. Step 5: Solve for x
    x = 657,059.56/682.08
  6. Step 6: Final answer
    x = 963.32

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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.