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Finding the Fourth Proportional to 1,864.02, 2,796.21 and 768.90

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Solution

The fourth proportional to 1,864.02, 2,796.21 and 768.90 is: 1,153.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,864.02 : 2,796.21 = 768.90 : x
  2. Step 2: Convert to fraction form
    1,864.02/2,796.21 = 768.90/x
  3. Step 3: Cross multiply
    1,864.02x = 2,796.21 × 768.90
  4. Step 4: Simplify right side
    1,864.02x = 2,150,005.87
  5. Step 5: Solve for x
    x = 2,150,005.87/1,864.02
  6. Step 6: Final answer
    x = 1,153.42

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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.