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Finding the Fourth Proportional to 1,936.99, 2,905.21 and 638.02

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Solution

The fourth proportional to 1,936.99, 2,905.21 and 638.02 is: 956.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,936.99 : 2,905.21 = 638.02 : x
  2. Step 2: Convert to fraction form
    1,936.99/2,905.21 = 638.02/x
  3. Step 3: Cross multiply
    1,936.99x = 2,905.21 × 638.02
  4. Step 4: Simplify right side
    1,936.99x = 1,853,566.58
  5. Step 5: Solve for x
    x = 1,853,566.58/1,936.99
  6. Step 6: Final answer
    x = 956.93

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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.