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Finding the Fourth Proportional to 1,418.96, 2,128.50 and 445.14

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Solution

The fourth proportional to 1,418.96, 2,128.50 and 445.14 is: 667.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.96 : 2,128.50 = 445.14 : x
  2. Step 2: Convert to fraction form
    1,418.96/2,128.50 = 445.14/x
  3. Step 3: Cross multiply
    1,418.96x = 2,128.50 × 445.14
  4. Step 4: Simplify right side
    1,418.96x = 947,480.49
  5. Step 5: Solve for x
    x = 947,480.49/1,418.96
  6. Step 6: Final answer
    x = 667.73

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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.