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Finding the Fourth Proportional to 839.15, 1,257.87 and 318.83

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Solution

The fourth proportional to 839.15, 1,257.87 and 318.83 is: 477.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.15 : 1,257.87 = 318.83 : x
  2. Step 2: Convert to fraction form
    839.15/1,257.87 = 318.83/x
  3. Step 3: Cross multiply
    839.15x = 1,257.87 × 318.83
  4. Step 4: Simplify right side
    839.15x = 401,046.69
  5. Step 5: Solve for x
    x = 401,046.69/839.15
  6. Step 6: Final answer
    x = 477.92

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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.