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Finding the Fourth Proportional to 1,419.20, 2,128.84 and 494.80

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Solution

The fourth proportional to 1,419.20, 2,128.84 and 494.80 is: 742.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.20 : 2,128.84 = 494.80 : x
  2. Step 2: Convert to fraction form
    1,419.20/2,128.84 = 494.80/x
  3. Step 3: Cross multiply
    1,419.20x = 2,128.84 × 494.80
  4. Step 4: Simplify right side
    1,419.20x = 1,053,350.03
  5. Step 5: Solve for x
    x = 1,053,350.03/1,419.20
  6. Step 6: Final answer
    x = 742.21

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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.