Home / 1,419.09-2,128.74-445.18

Finding the Fourth Proportional to 1,419.09, 2,128.74 and 445.18

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Solution

The fourth proportional to 1,419.09, 2,128.74 and 445.18 is: 667.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.09 : 2,128.74 = 445.18 : x
  2. Step 2: Convert to fraction form
    1,419.09/2,128.74 = 445.18/x
  3. Step 3: Cross multiply
    1,419.09x = 2,128.74 × 445.18
  4. Step 4: Simplify right side
    1,419.09x = 947,672.47
  5. Step 5: Solve for x
    x = 947,672.47/1,419.09
  6. Step 6: Final answer
    x = 667.80

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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.