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Finding the Fourth Proportional to 1,279.04, 1,918.78 and 629.84

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Solution

The fourth proportional to 1,279.04, 1,918.78 and 629.84 is: 944.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.04 : 1,918.78 = 629.84 : x
  2. Step 2: Convert to fraction form
    1,279.04/1,918.78 = 629.84/x
  3. Step 3: Cross multiply
    1,279.04x = 1,918.78 × 629.84
  4. Step 4: Simplify right side
    1,279.04x = 1,208,524.40
  5. Step 5: Solve for x
    x = 1,208,524.40/1,279.04
  6. Step 6: Final answer
    x = 944.87

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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.