Home / 1,352.49-2,028.77-428.05

Finding the Fourth Proportional to 1,352.49, 2,028.77 and 428.05

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Solution

The fourth proportional to 1,352.49, 2,028.77 and 428.05 is: 642.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,352.49 : 2,028.77 = 428.05 : x
  2. Step 2: Convert to fraction form
    1,352.49/2,028.77 = 428.05/x
  3. Step 3: Cross multiply
    1,352.49x = 2,028.77 × 428.05
  4. Step 4: Simplify right side
    1,352.49x = 868,415.00
  5. Step 5: Solve for x
    x = 868,415.00/1,352.49
  6. Step 6: Final answer
    x = 642.09

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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.