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Finding the Fourth Proportional to 1,352.97, 2,029.59 and 428.49

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Solution

The fourth proportional to 1,352.97, 2,029.59 and 428.49 is: 642.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,352.97 : 2,029.59 = 428.49 : x
  2. Step 2: Convert to fraction form
    1,352.97/2,029.59 = 428.49/x
  3. Step 3: Cross multiply
    1,352.97x = 2,029.59 × 428.49
  4. Step 4: Simplify right side
    1,352.97x = 869,659.02
  5. Step 5: Solve for x
    x = 869,659.02/1,352.97
  6. Step 6: Final answer
    x = 642.78

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Double scale
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1.5x scale

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.