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Finding the Fourth Proportional to 1,419.53, 2,129.39 and 445.70

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Solution

The fourth proportional to 1,419.53, 2,129.39 and 445.70 is: 668.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.53 : 2,129.39 = 445.70 : x
  2. Step 2: Convert to fraction form
    1,419.53/2,129.39 = 445.70/x
  3. Step 3: Cross multiply
    1,419.53x = 2,129.39 × 445.70
  4. Step 4: Simplify right side
    1,419.53x = 949,073.89
  5. Step 5: Solve for x
    x = 949,073.89/1,419.53
  6. Step 6: Final answer
    x = 668.59

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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.