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Finding the Fourth Proportional to 1,371.71, 2,057.91 and 397.91

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Solution

The fourth proportional to 1,371.71, 2,057.91 and 397.91 is: 596.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.71 : 2,057.91 = 397.91 : x
  2. Step 2: Convert to fraction form
    1,371.71/2,057.91 = 397.91/x
  3. Step 3: Cross multiply
    1,371.71x = 2,057.91 × 397.91
  4. Step 4: Simplify right side
    1,371.71x = 818,866.62
  5. Step 5: Solve for x
    x = 818,866.62/1,371.71
  6. Step 6: Final answer
    x = 596.97

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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.