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Finding the Fourth Proportional to 682.12, 1,023.01 and 316.56

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Solution

The fourth proportional to 682.12, 1,023.01 and 316.56 is: 474.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.12 : 1,023.01 = 316.56 : x
  2. Step 2: Convert to fraction form
    682.12/1,023.01 = 316.56/x
  3. Step 3: Cross multiply
    682.12x = 1,023.01 × 316.56
  4. Step 4: Simplify right side
    682.12x = 323,844.05
  5. Step 5: Solve for x
    x = 323,844.05/682.12
  6. Step 6: Final answer
    x = 474.76

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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.