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Finding the Fourth Proportional to 681.60, 940.21 and 494.88

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Solution

The fourth proportional to 681.60, 940.21 and 494.88 is: 682.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.60 : 940.21 = 494.88 : x
  2. Step 2: Convert to fraction form
    681.60/940.21 = 494.88/x
  3. Step 3: Cross multiply
    681.60x = 940.21 × 494.88
  4. Step 4: Simplify right side
    681.60x = 465,291.12
  5. Step 5: Solve for x
    x = 465,291.12/681.60
  6. Step 6: Final answer
    x = 682.65

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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.