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Finding the Fourth Proportional to 1,126.62, 1,554.63 and 629.21

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Solution

The fourth proportional to 1,126.62, 1,554.63 and 629.21 is: 868.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.62 : 1,554.63 = 629.21 : x
  2. Step 2: Convert to fraction form
    1,126.62/1,554.63 = 629.21/x
  3. Step 3: Cross multiply
    1,126.62x = 1,554.63 × 629.21
  4. Step 4: Simplify right side
    1,126.62x = 978,180.97
  5. Step 5: Solve for x
    x = 978,180.97/1,126.62
  6. Step 6: Final answer
    x = 868.24

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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.