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Finding the Fourth Proportional to 822.57, 1,231.82 and 638.43

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Solution

The fourth proportional to 822.57, 1,231.82 and 638.43 is: 956.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.57 : 1,231.82 = 638.43 : x
  2. Step 2: Convert to fraction form
    822.57/1,231.82 = 638.43/x
  3. Step 3: Cross multiply
    822.57x = 1,231.82 × 638.43
  4. Step 4: Simplify right side
    822.57x = 786,430.84
  5. Step 5: Solve for x
    x = 786,430.84/822.57
  6. Step 6: Final answer
    x = 956.07

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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.