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Finding the Fourth Proportional to 681.22, 939.67 and 484.39

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Solution

The fourth proportional to 681.22, 939.67 and 484.39 is: 668.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.22 : 939.67 = 484.39 : x
  2. Step 2: Convert to fraction form
    681.22/939.67 = 484.39/x
  3. Step 3: Cross multiply
    681.22x = 939.67 × 484.39
  4. Step 4: Simplify right side
    681.22x = 455,166.75
  5. Step 5: Solve for x
    x = 455,166.75/681.22
  6. Step 6: Final answer
    x = 668.16

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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.