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Finding the Fourth Proportional to 1,238.60, 1,857.70 and 458.97

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Solution

The fourth proportional to 1,238.60, 1,857.70 and 458.97 is: 688.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.60 : 1,857.70 = 458.97 : x
  2. Step 2: Convert to fraction form
    1,238.60/1,857.70 = 458.97/x
  3. Step 3: Cross multiply
    1,238.60x = 1,857.70 × 458.97
  4. Step 4: Simplify right side
    1,238.60x = 852,628.57
  5. Step 5: Solve for x
    x = 852,628.57/1,238.60
  6. Step 6: Final answer
    x = 688.38

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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.