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Finding the Fourth Proportional to 1,352.73, 2,028.53 and 428.04

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Solution

The fourth proportional to 1,352.73, 2,028.53 and 428.04 is: 641.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,352.73 : 2,028.53 = 428.04 : x
  2. Step 2: Convert to fraction form
    1,352.73/2,028.53 = 428.04/x
  3. Step 3: Cross multiply
    1,352.73x = 2,028.53 × 428.04
  4. Step 4: Simplify right side
    1,352.73x = 868,289.84
  5. Step 5: Solve for x
    x = 868,289.84/1,352.73
  6. Step 6: Final answer
    x = 641.88

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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.