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Finding the Fourth Proportional to 821.67, 1,232.50 and 638.54

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Solution

The fourth proportional to 821.67, 1,232.50 and 638.54 is: 957.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.67 : 1,232.50 = 638.54 : x
  2. Step 2: Convert to fraction form
    821.67/1,232.50 = 638.54/x
  3. Step 3: Cross multiply
    821.67x = 1,232.50 × 638.54
  4. Step 4: Simplify right side
    821.67x = 787,000.55
  5. Step 5: Solve for x
    x = 787,000.55/821.67
  6. Step 6: Final answer
    x = 957.81

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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.