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Finding the Fourth Proportional to 855.05, 1,279.82 and 608.09

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Solution

The fourth proportional to 855.05, 1,279.82 and 608.09 is: 910.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.05 : 1,279.82 = 608.09 : x
  2. Step 2: Convert to fraction form
    855.05/1,279.82 = 608.09/x
  3. Step 3: Cross multiply
    855.05x = 1,279.82 × 608.09
  4. Step 4: Simplify right side
    855.05x = 778,236.30
  5. Step 5: Solve for x
    x = 778,236.30/855.05
  6. Step 6: Final answer
    x = 910.17

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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.