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Finding the Fourth Proportional to 681.26, 939.89 and 415.60

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Solution

The fourth proportional to 681.26, 939.89 and 415.60 is: 573.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.26 : 939.89 = 415.60 : x
  2. Step 2: Convert to fraction form
    681.26/939.89 = 415.60/x
  3. Step 3: Cross multiply
    681.26x = 939.89 × 415.60
  4. Step 4: Simplify right side
    681.26x = 390,616.97
  5. Step 5: Solve for x
    x = 390,616.97/681.26
  6. Step 6: Final answer
    x = 573.38

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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.