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Finding the Fourth Proportional to 1,238.29, 1,857.64 and 458.30

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Solution

The fourth proportional to 1,238.29, 1,857.64 and 458.30 is: 687.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.29 : 1,857.64 = 458.30 : x
  2. Step 2: Convert to fraction form
    1,238.29/1,857.64 = 458.30/x
  3. Step 3: Cross multiply
    1,238.29x = 1,857.64 × 458.30
  4. Step 4: Simplify right side
    1,238.29x = 851,356.41
  5. Step 5: Solve for x
    x = 851,356.41/1,238.29
  6. Step 6: Final answer
    x = 687.53

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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.