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Finding the Fourth Proportional to 839.89, 1,260.81 and 493.48

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Solution

The fourth proportional to 839.89, 1,260.81 and 493.48 is: 740.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.89 : 1,260.81 = 493.48 : x
  2. Step 2: Convert to fraction form
    839.89/1,260.81 = 493.48/x
  3. Step 3: Cross multiply
    839.89x = 1,260.81 × 493.48
  4. Step 4: Simplify right side
    839.89x = 622,184.52
  5. Step 5: Solve for x
    x = 622,184.52/839.89
  6. Step 6: Final answer
    x = 740.79

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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.