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Finding the Fourth Proportional to 705.36, 1,057.40 and 272.80

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Solution

The fourth proportional to 705.36, 1,057.40 and 272.80 is: 408.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.36 : 1,057.40 = 272.80 : x
  2. Step 2: Convert to fraction form
    705.36/1,057.40 = 272.80/x
  3. Step 3: Cross multiply
    705.36x = 1,057.40 × 272.80
  4. Step 4: Simplify right side
    705.36x = 288,458.72
  5. Step 5: Solve for x
    x = 288,458.72/705.36
  6. Step 6: Final answer
    x = 408.95

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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.