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Finding the Fourth Proportional to 681.62, 1,021.86 and 356.81

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Solution

The fourth proportional to 681.62, 1,021.86 and 356.81 is: 534.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.62 : 1,021.86 = 356.81 : x
  2. Step 2: Convert to fraction form
    681.62/1,021.86 = 356.81/x
  3. Step 3: Cross multiply
    681.62x = 1,021.86 × 356.81
  4. Step 4: Simplify right side
    681.62x = 364,604.76
  5. Step 5: Solve for x
    x = 364,604.76/681.62
  6. Step 6: Final answer
    x = 534.91

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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.