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Finding the Fourth Proportional to 681.47, 1,022.21 and 187.87

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Solution

The fourth proportional to 681.47, 1,022.21 and 187.87 is: 281.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.47 : 1,022.21 = 187.87 : x
  2. Step 2: Convert to fraction form
    681.47/1,022.21 = 187.87/x
  3. Step 3: Cross multiply
    681.47x = 1,022.21 × 187.87
  4. Step 4: Simplify right side
    681.47x = 192,039.57
  5. Step 5: Solve for x
    x = 192,039.57/681.47
  6. Step 6: Final answer
    x = 281.80

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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.