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Finding the Fourth Proportional to 1,808.80, 2,713.56 and 768.78

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Solution

The fourth proportional to 1,808.80, 2,713.56 and 768.78 is: 1,153.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.80 : 2,713.56 = 768.78 : x
  2. Step 2: Convert to fraction form
    1,808.80/2,713.56 = 768.78/x
  3. Step 3: Cross multiply
    1,808.80x = 2,713.56 × 768.78
  4. Step 4: Simplify right side
    1,808.80x = 2,086,130.66
  5. Step 5: Solve for x
    x = 2,086,130.66/1,808.80
  6. Step 6: Final answer
    x = 1,153.32

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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.