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Finding the Fourth Proportional to 705.48, 1,057.72 and 272.36

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Solution

The fourth proportional to 705.48, 1,057.72 and 272.36 is: 408.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.48 : 1,057.72 = 272.36 : x
  2. Step 2: Convert to fraction form
    705.48/1,057.72 = 272.36/x
  3. Step 3: Cross multiply
    705.48x = 1,057.72 × 272.36
  4. Step 4: Simplify right side
    705.48x = 288,080.62
  5. Step 5: Solve for x
    x = 288,080.62/705.48
  6. Step 6: Final answer
    x = 408.35

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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.