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Finding the Fourth Proportional to 1,112.78, 1,669.16 and 382.41

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Solution

The fourth proportional to 1,112.78, 1,669.16 and 382.41 is: 573.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.78 : 1,669.16 = 382.41 : x
  2. Step 2: Convert to fraction form
    1,112.78/1,669.16 = 382.41/x
  3. Step 3: Cross multiply
    1,112.78x = 1,669.16 × 382.41
  4. Step 4: Simplify right side
    1,112.78x = 638,301.56
  5. Step 5: Solve for x
    x = 638,301.56/1,112.78
  6. Step 6: Final answer
    x = 573.61

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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.