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Finding the Fourth Proportional to 1,379.13, 2,067.73 and 648

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Solution

The fourth proportional to 1,379.13, 2,067.73 and 648 is: 971.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.13 : 2,067.73 = 648 : x
  2. Step 2: Convert to fraction form
    1,379.13/2,067.73 = 648/x
  3. Step 3: Cross multiply
    1,379.13x = 2,067.73 × 648
  4. Step 4: Simplify right side
    1,379.13x = 1,339,887.42
  5. Step 5: Solve for x
    x = 1,339,887.42/1,379.13
  6. Step 6: Final answer
    x = 971.55

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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.