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Finding the Fourth Proportional to 1,112.15, 1,666.39 and 381.33

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Solution

The fourth proportional to 1,112.15, 1,666.39 and 381.33 is: 571.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.15 : 1,666.39 = 381.33 : x
  2. Step 2: Convert to fraction form
    1,112.15/1,666.39 = 381.33/x
  3. Step 3: Cross multiply
    1,112.15x = 1,666.39 × 381.33
  4. Step 4: Simplify right side
    1,112.15x = 635,444.50
  5. Step 5: Solve for x
    x = 635,444.50/1,112.15
  6. Step 6: Final answer
    x = 571.37

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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.