Home / 1,419.45-2,128.56-445.35

Finding the Fourth Proportional to 1,419.45, 2,128.56 and 445.35

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Solution

The fourth proportional to 1,419.45, 2,128.56 and 445.35 is: 667.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.45 : 2,128.56 = 445.35 : x
  2. Step 2: Convert to fraction form
    1,419.45/2,128.56 = 445.35/x
  3. Step 3: Cross multiply
    1,419.45x = 2,128.56 × 445.35
  4. Step 4: Simplify right side
    1,419.45x = 947,954.20
  5. Step 5: Solve for x
    x = 947,954.20/1,419.45
  6. Step 6: Final answer
    x = 667.83

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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.