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Finding the Fourth Proportional to 1,379.28, 2,067.48 and 648.12

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Solution

The fourth proportional to 1,379.28, 2,067.48 and 648.12 is: 971.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.28 : 2,067.48 = 648.12 : x
  2. Step 2: Convert to fraction form
    1,379.28/2,067.48 = 648.12/x
  3. Step 3: Cross multiply
    1,379.28x = 2,067.48 × 648.12
  4. Step 4: Simplify right side
    1,379.28x = 1,339,975.14
  5. Step 5: Solve for x
    x = 1,339,975.14/1,379.28
  6. Step 6: Final answer
    x = 971.50

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1.5x scale

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.