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Finding the Fourth Proportional to 1,489.68, 2,236.68 and 1,079.28

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Solution

The fourth proportional to 1,489.68, 2,236.68 and 1,079.28 is: 1,620.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.68 : 2,236.68 = 1,079.28 : x
  2. Step 2: Convert to fraction form
    1,489.68/2,236.68 = 1,079.28/x
  3. Step 3: Cross multiply
    1,489.68x = 2,236.68 × 1,079.28
  4. Step 4: Simplify right side
    1,489.68x = 2,414,003.99
  5. Step 5: Solve for x
    x = 2,414,003.99/1,489.68
  6. Step 6: Final answer
    x = 1,620.48

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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.