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Finding the Fourth Proportional to 681.92, 940.90 and 419.88

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Solution

The fourth proportional to 681.92, 940.90 and 419.88 is: 579.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.92 : 940.90 = 419.88 : x
  2. Step 2: Convert to fraction form
    681.92/940.90 = 419.88/x
  3. Step 3: Cross multiply
    681.92x = 940.90 × 419.88
  4. Step 4: Simplify right side
    681.92x = 395,062.99
  5. Step 5: Solve for x
    x = 395,062.99/681.92
  6. Step 6: Final answer
    x = 579.34

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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.