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Finding the Fourth Proportional to 705.29, 1,057.42 and 272.25

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Solution

The fourth proportional to 705.29, 1,057.42 and 272.25 is: 408.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.29 : 1,057.42 = 272.25 : x
  2. Step 2: Convert to fraction form
    705.29/1,057.42 = 272.25/x
  3. Step 3: Cross multiply
    705.29x = 1,057.42 × 272.25
  4. Step 4: Simplify right side
    705.29x = 287,881.23
  5. Step 5: Solve for x
    x = 287,881.23/705.29
  6. Step 6: Final answer
    x = 408.17

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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.