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Finding the Fourth Proportional to 1,352.94, 2,029.49 and 428.53

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Solution

The fourth proportional to 1,352.94, 2,029.49 and 428.53 is: 642.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,352.94 : 2,029.49 = 428.53 : x
  2. Step 2: Convert to fraction form
    1,352.94/2,029.49 = 428.53/x
  3. Step 3: Cross multiply
    1,352.94x = 2,029.49 × 428.53
  4. Step 4: Simplify right side
    1,352.94x = 869,685.06
  5. Step 5: Solve for x
    x = 869,685.06/1,352.94
  6. Step 6: Final answer
    x = 642.81

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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.