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Finding the Fourth Proportional to 681.47, 1,021.94 and 270.66

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Solution

The fourth proportional to 681.47, 1,021.94 and 270.66 is: 405.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.47 : 1,021.94 = 270.66 : x
  2. Step 2: Convert to fraction form
    681.47/1,021.94 = 270.66/x
  3. Step 3: Cross multiply
    681.47x = 1,021.94 × 270.66
  4. Step 4: Simplify right side
    681.47x = 276,596.93
  5. Step 5: Solve for x
    x = 276,596.93/681.47
  6. Step 6: Final answer
    x = 405.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.