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Finding the Fourth Proportional to 682.39, 1,024.61 and 409.70

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Solution

The fourth proportional to 682.39, 1,024.61 and 409.70 is: 615.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.39 : 1,024.61 = 409.70 : x
  2. Step 2: Convert to fraction form
    682.39/1,024.61 = 409.70/x
  3. Step 3: Cross multiply
    682.39x = 1,024.61 × 409.70
  4. Step 4: Simplify right side
    682.39x = 419,782.72
  5. Step 5: Solve for x
    x = 419,782.72/682.39
  6. Step 6: Final answer
    x = 615.17

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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.