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Finding the Fourth Proportional to 838.58, 1,258.09 and 318.57

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Solution

The fourth proportional to 838.58, 1,258.09 and 318.57 is: 477.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.58 : 1,258.09 = 318.57 : x
  2. Step 2: Convert to fraction form
    838.58/1,258.09 = 318.57/x
  3. Step 3: Cross multiply
    838.58x = 1,258.09 × 318.57
  4. Step 4: Simplify right side
    838.58x = 400,786.65
  5. Step 5: Solve for x
    x = 400,786.65/838.58
  6. Step 6: Final answer
    x = 477.94

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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.