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Finding the Fourth Proportional to 550.92, 821.94 and 485.31

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Solution

The fourth proportional to 550.92, 821.94 and 485.31 is: 724.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.92 : 821.94 = 485.31 : x
  2. Step 2: Convert to fraction form
    550.92/821.94 = 485.31/x
  3. Step 3: Cross multiply
    550.92x = 821.94 × 485.31
  4. Step 4: Simplify right side
    550.92x = 398,895.70
  5. Step 5: Solve for x
    x = 398,895.70/550.92
  6. Step 6: Final answer
    x = 724.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.