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Finding the Fourth Proportional to 855.88, 1,181.79 and 637.18

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Solution

The fourth proportional to 855.88, 1,181.79 and 637.18 is: 879.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.88 : 1,181.79 = 637.18 : x
  2. Step 2: Convert to fraction form
    855.88/1,181.79 = 637.18/x
  3. Step 3: Cross multiply
    855.88x = 1,181.79 × 637.18
  4. Step 4: Simplify right side
    855.88x = 753,012.95
  5. Step 5: Solve for x
    x = 753,012.95/855.88
  6. Step 6: Final answer
    x = 879.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.