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Finding the Fourth Proportional to 855.79, 1,286.69 and 748.26

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Solution

The fourth proportional to 855.79, 1,286.69 and 748.26 is: 1,125.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.79 : 1,286.69 = 748.26 : x
  2. Step 2: Convert to fraction form
    855.79/1,286.69 = 748.26/x
  3. Step 3: Cross multiply
    855.79x = 1,286.69 × 748.26
  4. Step 4: Simplify right side
    855.79x = 962,774.92
  5. Step 5: Solve for x
    x = 962,774.92/855.79
  6. Step 6: Final answer
    x = 1,125.02

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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.