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Finding the Fourth Proportional to 1,287.82, 1,928.22 and 896.86

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Solution

The fourth proportional to 1,287.82, 1,928.22 and 896.86 is: 1,342.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.82 : 1,928.22 = 896.86 : x
  2. Step 2: Convert to fraction form
    1,287.82/1,928.22 = 896.86/x
  3. Step 3: Cross multiply
    1,287.82x = 1,928.22 × 896.86
  4. Step 4: Simplify right side
    1,287.82x = 1,729,343.39
  5. Step 5: Solve for x
    x = 1,729,343.39/1,287.82
  6. Step 6: Final answer
    x = 1,342.85

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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.