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Finding the Fourth Proportional to 705.72, 1,057.92 and 381.12

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Solution

The fourth proportional to 705.72, 1,057.92 and 381.12 is: 571.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.72 : 1,057.92 = 381.12 : x
  2. Step 2: Convert to fraction form
    705.72/1,057.92 = 381.12/x
  3. Step 3: Cross multiply
    705.72x = 1,057.92 × 381.12
  4. Step 4: Simplify right side
    705.72x = 403,194.47
  5. Step 5: Solve for x
    x = 403,194.47/705.72
  6. Step 6: Final answer
    x = 571.32

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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.