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Finding the Fourth Proportional to 682.92, 1,023.70 and 318

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Solution

The fourth proportional to 682.92, 1,023.70 and 318 is: 476.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.92 : 1,023.70 = 318 : x
  2. Step 2: Convert to fraction form
    682.92/1,023.70 = 318/x
  3. Step 3: Cross multiply
    682.92x = 1,023.70 × 318
  4. Step 4: Simplify right side
    682.92x = 325,536.60
  5. Step 5: Solve for x
    x = 325,536.60/682.92
  6. Step 6: Final answer
    x = 476.68

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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.