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Finding the Fourth Proportional to 839.87, 1,257.49 and 633.83

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Solution

The fourth proportional to 839.87, 1,257.49 and 633.83 is: 948.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.87 : 1,257.49 = 633.83 : x
  2. Step 2: Convert to fraction form
    839.87/1,257.49 = 633.83/x
  3. Step 3: Cross multiply
    839.87x = 1,257.49 × 633.83
  4. Step 4: Simplify right side
    839.87x = 797,029.39
  5. Step 5: Solve for x
    x = 797,029.39/839.87
  6. Step 6: Final answer
    x = 948.99

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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.