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Finding the Fourth Proportional to 1,419.82, 2,129.42 and 445.70

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Solution

The fourth proportional to 1,419.82, 2,129.42 and 445.70 is: 668.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.82 : 2,129.42 = 445.70 : x
  2. Step 2: Convert to fraction form
    1,419.82/2,129.42 = 445.70/x
  3. Step 3: Cross multiply
    1,419.82x = 2,129.42 × 445.70
  4. Step 4: Simplify right side
    1,419.82x = 949,088.93
  5. Step 5: Solve for x
    x = 949,088.93/1,419.82
  6. Step 6: Final answer
    x = 668.46

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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.