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Finding the Fourth Proportional to 1,238.38, 1,857.78 and 416.48

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Solution

The fourth proportional to 1,238.38, 1,857.78 and 416.48 is: 624.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.38 : 1,857.78 = 416.48 : x
  2. Step 2: Convert to fraction form
    1,238.38/1,857.78 = 416.48/x
  3. Step 3: Cross multiply
    1,238.38x = 1,857.78 × 416.48
  4. Step 4: Simplify right side
    1,238.38x = 773,718.93
  5. Step 5: Solve for x
    x = 773,718.93/1,238.38
  6. Step 6: Final answer
    x = 624.78

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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.