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Finding the Fourth Proportional to 1,111.86, 1,667.40 and 381.26

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Solution

The fourth proportional to 1,111.86, 1,667.40 and 381.26 is: 571.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.86 : 1,667.40 = 381.26 : x
  2. Step 2: Convert to fraction form
    1,111.86/1,667.40 = 381.26/x
  3. Step 3: Cross multiply
    1,111.86x = 1,667.40 × 381.26
  4. Step 4: Simplify right side
    1,111.86x = 635,712.92
  5. Step 5: Solve for x
    x = 635,712.92/1,111.86
  6. Step 6: Final answer
    x = 571.76

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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.