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Finding the Fourth Proportional to 1,299.11, 1,947.24 and 639.97

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Solution

The fourth proportional to 1,299.11, 1,947.24 and 639.97 is: 959.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.11 : 1,947.24 = 639.97 : x
  2. Step 2: Convert to fraction form
    1,299.11/1,947.24 = 639.97/x
  3. Step 3: Cross multiply
    1,299.11x = 1,947.24 × 639.97
  4. Step 4: Simplify right side
    1,299.11x = 1,246,170.31
  5. Step 5: Solve for x
    x = 1,246,170.31/1,299.11
  6. Step 6: Final answer
    x = 959.25

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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.