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Finding the Fourth Proportional to 1,938.58, 2,905.87 and 768.11

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Solution

The fourth proportional to 1,938.58, 2,905.87 and 768.11 is: 1,151.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.58 : 2,905.87 = 768.11 : x
  2. Step 2: Convert to fraction form
    1,938.58/2,905.87 = 768.11/x
  3. Step 3: Cross multiply
    1,938.58x = 2,905.87 × 768.11
  4. Step 4: Simplify right side
    1,938.58x = 2,232,027.81
  5. Step 5: Solve for x
    x = 2,232,027.81/1,938.58
  6. Step 6: Final answer
    x = 1,151.37

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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.