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Finding the Fourth Proportional to 1,305.81, 1,959.21 and 786.18

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Solution

The fourth proportional to 1,305.81, 1,959.21 and 786.18 is: 1,179.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.81 : 1,959.21 = 786.18 : x
  2. Step 2: Convert to fraction form
    1,305.81/1,959.21 = 786.18/x
  3. Step 3: Cross multiply
    1,305.81x = 1,959.21 × 786.18
  4. Step 4: Simplify right side
    1,305.81x = 1,540,291.72
  5. Step 5: Solve for x
    x = 1,540,291.72/1,305.81
  6. Step 6: Final answer
    x = 1,179.57

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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.