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Finding the Fourth Proportional to 705.88, 1,057.38 and 321.40

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Solution

The fourth proportional to 705.88, 1,057.38 and 321.40 is: 481.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.88 : 1,057.38 = 321.40 : x
  2. Step 2: Convert to fraction form
    705.88/1,057.38 = 321.40/x
  3. Step 3: Cross multiply
    705.88x = 1,057.38 × 321.40
  4. Step 4: Simplify right side
    705.88x = 339,841.93
  5. Step 5: Solve for x
    x = 339,841.93/705.88
  6. Step 6: Final answer
    x = 481.44

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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.