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Finding the Fourth Proportional to 855.22, 1,287.80 and 725.68

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Solution

The fourth proportional to 855.22, 1,287.80 and 725.68 is: 1,092.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.22 : 1,287.80 = 725.68 : x
  2. Step 2: Convert to fraction form
    855.22/1,287.80 = 725.68/x
  3. Step 3: Cross multiply
    855.22x = 1,287.80 × 725.68
  4. Step 4: Simplify right side
    855.22x = 934,530.70
  5. Step 5: Solve for x
    x = 934,530.70/855.22
  6. Step 6: Final answer
    x = 1,092.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.