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Finding the Fourth Proportional to 1,238.28, 1,857.30 and 458.28

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Solution

The fourth proportional to 1,238.28, 1,857.30 and 458.28 is: 687.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.28 : 1,857.30 = 458.28 : x
  2. Step 2: Convert to fraction form
    1,238.28/1,857.30 = 458.28/x
  3. Step 3: Cross multiply
    1,238.28x = 1,857.30 × 458.28
  4. Step 4: Simplify right side
    1,238.28x = 851,163.44
  5. Step 5: Solve for x
    x = 851,163.44/1,238.28
  6. Step 6: Final answer
    x = 687.38

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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.