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Finding the Fourth Proportional to 855.82, 1,281.70 and 671.95

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Solution

The fourth proportional to 855.82, 1,281.70 and 671.95 is: 1,006.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.82 : 1,281.70 = 671.95 : x
  2. Step 2: Convert to fraction form
    855.82/1,281.70 = 671.95/x
  3. Step 3: Cross multiply
    855.82x = 1,281.70 × 671.95
  4. Step 4: Simplify right side
    855.82x = 861,238.32
  5. Step 5: Solve for x
    x = 861,238.32/855.82
  6. Step 6: Final answer
    x = 1,006.33

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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.