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Finding the Fourth Proportional to 447.26, 618.86 and 389.17

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Solution

The fourth proportional to 447.26, 618.86 and 389.17 is: 538.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.26 : 618.86 = 389.17 : x
  2. Step 2: Convert to fraction form
    447.26/618.86 = 389.17/x
  3. Step 3: Cross multiply
    447.26x = 618.86 × 389.17
  4. Step 4: Simplify right side
    447.26x = 240,841.17
  5. Step 5: Solve for x
    x = 240,841.17/447.26
  6. Step 6: Final answer
    x = 538.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.