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Finding the Fourth Proportional to 1,279.16, 1,918 and 629.08

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Solution

The fourth proportional to 1,279.16, 1,918 and 629.08 is: 943.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.16 : 1,918 = 629.08 : x
  2. Step 2: Convert to fraction form
    1,279.16/1,918 = 629.08/x
  3. Step 3: Cross multiply
    1,279.16x = 1,918 × 629.08
  4. Step 4: Simplify right side
    1,279.16x = 1,206,575.44
  5. Step 5: Solve for x
    x = 1,206,575.44/1,279.16
  6. Step 6: Final answer
    x = 943.26

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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.