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Finding the Fourth Proportional to 823.60, 1,231.62 and 638.56

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Solution

The fourth proportional to 823.60, 1,231.62 and 638.56 is: 954.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.60 : 1,231.62 = 638.56 : x
  2. Step 2: Convert to fraction form
    823.60/1,231.62 = 638.56/x
  3. Step 3: Cross multiply
    823.60x = 1,231.62 × 638.56
  4. Step 4: Simplify right side
    823.60x = 786,463.27
  5. Step 5: Solve for x
    x = 786,463.27/823.60
  6. Step 6: Final answer
    x = 954.91

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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.