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Finding the Fourth Proportional to 1,419.88, 2,129.22 and 689.08

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Solution

The fourth proportional to 1,419.88, 2,129.22 and 689.08 is: 1,033.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.88 : 2,129.22 = 689.08 : x
  2. Step 2: Convert to fraction form
    1,419.88/2,129.22 = 689.08/x
  3. Step 3: Cross multiply
    1,419.88x = 2,129.22 × 689.08
  4. Step 4: Simplify right side
    1,419.88x = 1,467,202.92
  5. Step 5: Solve for x
    x = 1,467,202.92/1,419.88
  6. Step 6: Final answer
    x = 1,033.33

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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.