Home / 1,638.38-2,260.96-939.75

Finding the Fourth Proportional to 1,638.38, 2,260.96 and 939.75

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Solution

The fourth proportional to 1,638.38, 2,260.96 and 939.75 is: 1,296.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.38 : 2,260.96 = 939.75 : x
  2. Step 2: Convert to fraction form
    1,638.38/2,260.96 = 939.75/x
  3. Step 3: Cross multiply
    1,638.38x = 2,260.96 × 939.75
  4. Step 4: Simplify right side
    1,638.38x = 2,124,737.16
  5. Step 5: Solve for x
    x = 2,124,737.16/1,638.38
  6. Step 6: Final answer
    x = 1,296.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.