Home / 1,419.31-2,128.96-445.49

Finding the Fourth Proportional to 1,419.31, 2,128.96 and 445.49

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Solution

The fourth proportional to 1,419.31, 2,128.96 and 445.49 is: 668.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.31 : 2,128.96 = 445.49 : x
  2. Step 2: Convert to fraction form
    1,419.31/2,128.96 = 445.49/x
  3. Step 3: Cross multiply
    1,419.31x = 2,128.96 × 445.49
  4. Step 4: Simplify right side
    1,419.31x = 948,419.75
  5. Step 5: Solve for x
    x = 948,419.75/1,419.31
  6. Step 6: Final answer
    x = 668.23

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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.