Home / 1,419.13-2,128.70-445.23

Finding the Fourth Proportional to 1,419.13, 2,128.70 and 445.23

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Solution

The fourth proportional to 1,419.13, 2,128.70 and 445.23 is: 667.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.13 : 2,128.70 = 445.23 : x
  2. Step 2: Convert to fraction form
    1,419.13/2,128.70 = 445.23/x
  3. Step 3: Cross multiply
    1,419.13x = 2,128.70 × 445.23
  4. Step 4: Simplify right side
    1,419.13x = 947,761.10
  5. Step 5: Solve for x
    x = 947,761.10/1,419.13
  6. Step 6: Final answer
    x = 667.85

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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.