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Finding the Fourth Proportional to 1,936.70, 2,905.48 and 638.08

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Solution

The fourth proportional to 1,936.70, 2,905.48 and 638.08 is: 957.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,936.70 : 2,905.48 = 638.08 : x
  2. Step 2: Convert to fraction form
    1,936.70/2,905.48 = 638.08/x
  3. Step 3: Cross multiply
    1,936.70x = 2,905.48 × 638.08
  4. Step 4: Simplify right side
    1,936.70x = 1,853,928.68
  5. Step 5: Solve for x
    x = 1,853,928.68/1,936.70
  6. Step 6: Final answer
    x = 957.26

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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.