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Finding the Fourth Proportional to 1,279.17, 1,919.61 and 629.91

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Solution

The fourth proportional to 1,279.17, 1,919.61 and 629.91 is: 945.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.17 : 1,919.61 = 629.91 : x
  2. Step 2: Convert to fraction form
    1,279.17/1,919.61 = 629.91/x
  3. Step 3: Cross multiply
    1,279.17x = 1,919.61 × 629.91
  4. Step 4: Simplify right side
    1,279.17x = 1,209,181.54
  5. Step 5: Solve for x
    x = 1,209,181.54/1,279.17
  6. Step 6: Final answer
    x = 945.29

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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.