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Finding the Fourth Proportional to 839.92, 1,260.09 and 493.54

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Solution

The fourth proportional to 839.92, 1,260.09 and 493.54 is: 740.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.92 : 1,260.09 = 493.54 : x
  2. Step 2: Convert to fraction form
    839.92/1,260.09 = 493.54/x
  3. Step 3: Cross multiply
    839.92x = 1,260.09 × 493.54
  4. Step 4: Simplify right side
    839.92x = 621,906.67
  5. Step 5: Solve for x
    x = 621,906.67/839.92
  6. Step 6: Final answer
    x = 740.44

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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.