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Finding the Fourth Proportional to 1,126.82, 1,555.02 and 629.48

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Solution

The fourth proportional to 1,126.82, 1,555.02 and 629.48 is: 868.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.82 : 1,555.02 = 629.48 : x
  2. Step 2: Convert to fraction form
    1,126.82/1,555.02 = 629.48/x
  3. Step 3: Cross multiply
    1,126.82x = 1,555.02 × 629.48
  4. Step 4: Simplify right side
    1,126.82x = 978,853.99
  5. Step 5: Solve for x
    x = 978,853.99/1,126.82
  6. Step 6: Final answer
    x = 868.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.