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Finding the Fourth Proportional to 682.72, 1,023.42 and 271.72

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Solution

The fourth proportional to 682.72, 1,023.42 and 271.72 is: 407.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.72 : 1,023.42 = 271.72 : x
  2. Step 2: Convert to fraction form
    682.72/1,023.42 = 271.72/x
  3. Step 3: Cross multiply
    682.72x = 1,023.42 × 271.72
  4. Step 4: Simplify right side
    682.72x = 278,083.68
  5. Step 5: Solve for x
    x = 278,083.68/682.72
  6. Step 6: Final answer
    x = 407.32

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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.