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Finding the Fourth Proportional to 1,936.79, 2,905.18 and 638.25

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Solution

The fourth proportional to 1,936.79, 2,905.18 and 638.25 is: 957.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,936.79 : 2,905.18 = 638.25 : x
  2. Step 2: Convert to fraction form
    1,936.79/2,905.18 = 638.25/x
  3. Step 3: Cross multiply
    1,936.79x = 2,905.18 × 638.25
  4. Step 4: Simplify right side
    1,936.79x = 1,854,229.54
  5. Step 5: Solve for x
    x = 1,854,229.54/1,936.79
  6. Step 6: Final answer
    x = 957.37

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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.