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Finding the Fourth Proportional to 1,261.80, 1,892.79 and 439.83

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Solution

The fourth proportional to 1,261.80, 1,892.79 and 439.83 is: 659.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.80 : 1,892.79 = 439.83 : x
  2. Step 2: Convert to fraction form
    1,261.80/1,892.79 = 439.83/x
  3. Step 3: Cross multiply
    1,261.80x = 1,892.79 × 439.83
  4. Step 4: Simplify right side
    1,261.80x = 832,505.83
  5. Step 5: Solve for x
    x = 832,505.83/1,261.80
  6. Step 6: Final answer
    x = 659.78

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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.