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Finding the Fourth Proportional to 705.12, 1,057.65 and 329.82

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Solution

The fourth proportional to 705.12, 1,057.65 and 329.82 is: 494.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.12 : 1,057.65 = 329.82 : x
  2. Step 2: Convert to fraction form
    705.12/1,057.65 = 329.82/x
  3. Step 3: Cross multiply
    705.12x = 1,057.65 × 329.82
  4. Step 4: Simplify right side
    705.12x = 348,834.12
  5. Step 5: Solve for x
    x = 348,834.12/705.12
  6. Step 6: Final answer
    x = 494.72

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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.