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Finding the Fourth Proportional to 1,111.44, 1,667.16 and 381

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Solution

The fourth proportional to 1,111.44, 1,667.16 and 381 is: 571.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.44 : 1,667.16 = 381 : x
  2. Step 2: Convert to fraction form
    1,111.44/1,667.16 = 381/x
  3. Step 3: Cross multiply
    1,111.44x = 1,667.16 × 381
  4. Step 4: Simplify right side
    1,111.44x = 635,187.96
  5. Step 5: Solve for x
    x = 635,187.96/1,111.44
  6. Step 6: Final answer
    x = 571.50

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Double scale
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Similar ratio
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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.