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Finding the Fourth Proportional to 681.30, 939.57 and 484.98

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Solution

The fourth proportional to 681.30, 939.57 and 484.98 is: 668.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.30 : 939.57 = 484.98 : x
  2. Step 2: Convert to fraction form
    681.30/939.57 = 484.98/x
  3. Step 3: Cross multiply
    681.30x = 939.57 × 484.98
  4. Step 4: Simplify right side
    681.30x = 455,672.66
  5. Step 5: Solve for x
    x = 455,672.66/681.30
  6. Step 6: Final answer
    x = 668.83

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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.