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Finding the Fourth Proportional to 857.25, 1,181.91 and 635.82

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Solution

The fourth proportional to 857.25, 1,181.91 and 635.82 is: 876.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.25 : 1,181.91 = 635.82 : x
  2. Step 2: Convert to fraction form
    857.25/1,181.91 = 635.82/x
  3. Step 3: Cross multiply
    857.25x = 1,181.91 × 635.82
  4. Step 4: Simplify right side
    857.25x = 751,482.02
  5. Step 5: Solve for x
    x = 751,482.02/857.25
  6. Step 6: Final answer
    x = 876.62

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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.