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Finding the Fourth Proportional to 821.25, 1,230.33 and 409.91

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Solution

The fourth proportional to 821.25, 1,230.33 and 409.91 is: 614.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.25 : 1,230.33 = 409.91 : x
  2. Step 2: Convert to fraction form
    821.25/1,230.33 = 409.91/x
  3. Step 3: Cross multiply
    821.25x = 1,230.33 × 409.91
  4. Step 4: Simplify right side
    821.25x = 504,318.42
  5. Step 5: Solve for x
    x = 504,318.42/821.25
  6. Step 6: Final answer
    x = 614.09

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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.