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Finding the Fourth Proportional to 682.22, 1,021.62 and 486.92

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Solution

The fourth proportional to 682.22, 1,021.62 and 486.92 is: 729.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.22 : 1,021.62 = 486.92 : x
  2. Step 2: Convert to fraction form
    682.22/1,021.62 = 486.92/x
  3. Step 3: Cross multiply
    682.22x = 1,021.62 × 486.92
  4. Step 4: Simplify right side
    682.22x = 497,447.21
  5. Step 5: Solve for x
    x = 497,447.21/682.22
  6. Step 6: Final answer
    x = 729.16

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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.