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Finding the Fourth Proportional to 892.77, 1,231.44 and 643.68

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Solution

The fourth proportional to 892.77, 1,231.44 and 643.68 is: 887.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.77 : 1,231.44 = 643.68 : x
  2. Step 2: Convert to fraction form
    892.77/1,231.44 = 643.68/x
  3. Step 3: Cross multiply
    892.77x = 1,231.44 × 643.68
  4. Step 4: Simplify right side
    892.77x = 792,653.30
  5. Step 5: Solve for x
    x = 792,653.30/892.77
  6. Step 6: Final answer
    x = 887.86

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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.