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Finding the Fourth Proportional to 1,379.68, 2,069.49 and 648.85

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Solution

The fourth proportional to 1,379.68, 2,069.49 and 648.85 is: 973.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.68 : 2,069.49 = 648.85 : x
  2. Step 2: Convert to fraction form
    1,379.68/2,069.49 = 648.85/x
  3. Step 3: Cross multiply
    1,379.68x = 2,069.49 × 648.85
  4. Step 4: Simplify right side
    1,379.68x = 1,342,788.59
  5. Step 5: Solve for x
    x = 1,342,788.59/1,379.68
  6. Step 6: Final answer
    x = 973.26

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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.