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Finding the Fourth Proportional to 855.79, 1,181.57 and 631.76

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Solution

The fourth proportional to 855.79, 1,181.57 and 631.76 is: 872.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.79 : 1,181.57 = 631.76 : x
  2. Step 2: Convert to fraction form
    855.79/1,181.57 = 631.76/x
  3. Step 3: Cross multiply
    855.79x = 1,181.57 × 631.76
  4. Step 4: Simplify right side
    855.79x = 746,468.66
  5. Step 5: Solve for x
    x = 746,468.66/855.79
  6. Step 6: Final answer
    x = 872.26

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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.