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Finding the Fourth Proportional to 1,028.22, 1,419.03 and 629.88

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Solution

The fourth proportional to 1,028.22, 1,419.03 and 629.88 is: 869.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.22 : 1,419.03 = 629.88 : x
  2. Step 2: Convert to fraction form
    1,028.22/1,419.03 = 629.88/x
  3. Step 3: Cross multiply
    1,028.22x = 1,419.03 × 629.88
  4. Step 4: Simplify right side
    1,028.22x = 893,818.62
  5. Step 5: Solve for x
    x = 893,818.62/1,028.22
  6. Step 6: Final answer
    x = 869.29

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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.