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Finding the Fourth Proportional to 855.71, 1,286.43 and 675.28

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Solution

The fourth proportional to 855.71, 1,286.43 and 675.28 is: 1,015.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.71 : 1,286.43 = 675.28 : x
  2. Step 2: Convert to fraction form
    855.71/1,286.43 = 675.28/x
  3. Step 3: Cross multiply
    855.71x = 1,286.43 × 675.28
  4. Step 4: Simplify right side
    855.71x = 868,700.45
  5. Step 5: Solve for x
    x = 868,700.45/855.71
  6. Step 6: Final answer
    x = 1,015.18

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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.