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Finding the Fourth Proportional to 1,419.58, 2,129.70 and 445.68

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Solution

The fourth proportional to 1,419.58, 2,129.70 and 445.68 is: 668.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.58 : 2,129.70 = 445.68 : x
  2. Step 2: Convert to fraction form
    1,419.58/2,129.70 = 445.68/x
  3. Step 3: Cross multiply
    1,419.58x = 2,129.70 × 445.68
  4. Step 4: Simplify right side
    1,419.58x = 949,158.38
  5. Step 5: Solve for x
    x = 949,158.38/1,419.58
  6. Step 6: Final answer
    x = 668.62

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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.