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Finding the Fourth Proportional to 855.92, 1,283.28 and 764.72

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Solution

The fourth proportional to 855.92, 1,283.28 and 764.72 is: 1,146.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.92 : 1,283.28 = 764.72 : x
  2. Step 2: Convert to fraction form
    855.92/1,283.28 = 764.72/x
  3. Step 3: Cross multiply
    855.92x = 1,283.28 × 764.72
  4. Step 4: Simplify right side
    855.92x = 981,349.88
  5. Step 5: Solve for x
    x = 981,349.88/855.92
  6. Step 6: Final answer
    x = 1,146.54

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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.