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Finding the Fourth Proportional to 705.56, 1,057.11 and 381.15

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Solution

The fourth proportional to 705.56, 1,057.11 and 381.15 is: 571.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.56 : 1,057.11 = 381.15 : x
  2. Step 2: Convert to fraction form
    705.56/1,057.11 = 381.15/x
  3. Step 3: Cross multiply
    705.56x = 1,057.11 × 381.15
  4. Step 4: Simplify right side
    705.56x = 402,917.48
  5. Step 5: Solve for x
    x = 402,917.48/705.56
  6. Step 6: Final answer
    x = 571.06

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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.