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Finding the Fourth Proportional to 1,179.25, 1,767.86 and 485.49

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Solution

The fourth proportional to 1,179.25, 1,767.86 and 485.49 is: 727.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.25 : 1,767.86 = 485.49 : x
  2. Step 2: Convert to fraction form
    1,179.25/1,767.86 = 485.49/x
  3. Step 3: Cross multiply
    1,179.25x = 1,767.86 × 485.49
  4. Step 4: Simplify right side
    1,179.25x = 858,269.46
  5. Step 5: Solve for x
    x = 858,269.46/1,179.25
  6. Step 6: Final answer
    x = 727.81

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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.