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Finding the Fourth Proportional to 838.56, 1,258.11 and 318.54

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Solution

The fourth proportional to 838.56, 1,258.11 and 318.54 is: 477.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.56 : 1,258.11 = 318.54 : x
  2. Step 2: Convert to fraction form
    838.56/1,258.11 = 318.54/x
  3. Step 3: Cross multiply
    838.56x = 1,258.11 × 318.54
  4. Step 4: Simplify right side
    838.56x = 400,758.36
  5. Step 5: Solve for x
    x = 400,758.36/838.56
  6. Step 6: Final answer
    x = 477.91

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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.