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Finding the Fourth Proportional to 682.13, 941.40 and 420.23

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Solution

The fourth proportional to 682.13, 941.40 and 420.23 is: 579.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.13 : 941.40 = 420.23 : x
  2. Step 2: Convert to fraction form
    682.13/941.40 = 420.23/x
  3. Step 3: Cross multiply
    682.13x = 941.40 × 420.23
  4. Step 4: Simplify right side
    682.13x = 395,599.82
  5. Step 5: Solve for x
    x = 395,599.82/682.13
  6. Step 6: Final answer
    x = 579.95

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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.