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Finding the Fourth Proportional to 855.68, 1,273.28 and 852.80

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Solution

The fourth proportional to 855.68, 1,273.28 and 852.80 is: 1,268.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.68 : 1,273.28 = 852.80 : x
  2. Step 2: Convert to fraction form
    855.68/1,273.28 = 852.80/x
  3. Step 3: Cross multiply
    855.68x = 1,273.28 × 852.80
  4. Step 4: Simplify right side
    855.68x = 1,085,853.18
  5. Step 5: Solve for x
    x = 1,085,853.18/855.68
  6. Step 6: Final answer
    x = 1,268.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.