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Finding the Fourth Proportional to 1,419.39, 2,129.40 and 445.50

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Solution

The fourth proportional to 1,419.39, 2,129.40 and 445.50 is: 668.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.39 : 2,129.40 = 445.50 : x
  2. Step 2: Convert to fraction form
    1,419.39/2,129.40 = 445.50/x
  3. Step 3: Cross multiply
    1,419.39x = 2,129.40 × 445.50
  4. Step 4: Simplify right side
    1,419.39x = 948,647.70
  5. Step 5: Solve for x
    x = 948,647.70/1,419.39
  6. Step 6: Final answer
    x = 668.35

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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.