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Finding the Fourth Proportional to 1,080.38, 1,620.98 and 959.56

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Solution

The fourth proportional to 1,080.38, 1,620.98 and 959.56 is: 1,439.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.38 : 1,620.98 = 959.56 : x
  2. Step 2: Convert to fraction form
    1,080.38/1,620.98 = 959.56/x
  3. Step 3: Cross multiply
    1,080.38x = 1,620.98 × 959.56
  4. Step 4: Simplify right side
    1,080.38x = 1,555,427.57
  5. Step 5: Solve for x
    x = 1,555,427.57/1,080.38
  6. Step 6: Final answer
    x = 1,439.70

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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.