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Finding the Fourth Proportional to 682.74, 1,024.38 and 390.54

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Solution

The fourth proportional to 682.74, 1,024.38 and 390.54 is: 585.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.74 : 1,024.38 = 390.54 : x
  2. Step 2: Convert to fraction form
    682.74/1,024.38 = 390.54/x
  3. Step 3: Cross multiply
    682.74x = 1,024.38 × 390.54
  4. Step 4: Simplify right side
    682.74x = 400,061.37
  5. Step 5: Solve for x
    x = 400,061.37/682.74
  6. Step 6: Final answer
    x = 585.96

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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.