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Finding the Fourth Proportional to 1,299.66, 1,947.87 and 681.84

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Solution

The fourth proportional to 1,299.66, 1,947.87 and 681.84 is: 1,021.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.66 : 1,947.87 = 681.84 : x
  2. Step 2: Convert to fraction form
    1,299.66/1,947.87 = 681.84/x
  3. Step 3: Cross multiply
    1,299.66x = 1,947.87 × 681.84
  4. Step 4: Simplify right side
    1,299.66x = 1,328,135.68
  5. Step 5: Solve for x
    x = 1,328,135.68/1,299.66
  6. Step 6: Final answer
    x = 1,021.91

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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.