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Finding the Fourth Proportional to 682.80, 941.86 and 420.63

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Solution

The fourth proportional to 682.80, 941.86 and 420.63 is: 580.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.80 : 941.86 = 420.63 : x
  2. Step 2: Convert to fraction form
    682.80/941.86 = 420.63/x
  3. Step 3: Cross multiply
    682.80x = 941.86 × 420.63
  4. Step 4: Simplify right side
    682.80x = 396,174.57
  5. Step 5: Solve for x
    x = 396,174.57/682.80
  6. Step 6: Final answer
    x = 580.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.