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Finding the Fourth Proportional to 681.99, 941.18 and 420.09

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Solution

The fourth proportional to 681.99, 941.18 and 420.09 is: 579.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.99 : 941.18 = 420.09 : x
  2. Step 2: Convert to fraction form
    681.99/941.18 = 420.09/x
  3. Step 3: Cross multiply
    681.99x = 941.18 × 420.09
  4. Step 4: Simplify right side
    681.99x = 395,380.31
  5. Step 5: Solve for x
    x = 395,380.31/681.99
  6. Step 6: Final answer
    x = 579.75

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1.5x scale

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.