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Finding the Fourth Proportional to 705.26, 1,057.76 and 397.71

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Solution

The fourth proportional to 705.26, 1,057.76 and 397.71 is: 596.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.26 : 1,057.76 = 397.71 : x
  2. Step 2: Convert to fraction form
    705.26/1,057.76 = 397.71/x
  3. Step 3: Cross multiply
    705.26x = 1,057.76 × 397.71
  4. Step 4: Simplify right side
    705.26x = 420,681.23
  5. Step 5: Solve for x
    x = 420,681.23/705.26
  6. Step 6: Final answer
    x = 596.49

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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.