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Finding the Fourth Proportional to 681.77, 1,021.98 and 518.96

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Solution

The fourth proportional to 681.77, 1,021.98 and 518.96 is: 777.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.77 : 1,021.98 = 518.96 : x
  2. Step 2: Convert to fraction form
    681.77/1,021.98 = 518.96/x
  3. Step 3: Cross multiply
    681.77x = 1,021.98 × 518.96
  4. Step 4: Simplify right side
    681.77x = 530,366.74
  5. Step 5: Solve for x
    x = 530,366.74/681.77
  6. Step 6: Final answer
    x = 777.93

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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.