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Finding the Fourth Proportional to 371.36, 557.90 and 217.39

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Solution

The fourth proportional to 371.36, 557.90 and 217.39 is: 326.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.36 : 557.90 = 217.39 : x
  2. Step 2: Convert to fraction form
    371.36/557.90 = 217.39/x
  3. Step 3: Cross multiply
    371.36x = 557.90 × 217.39
  4. Step 4: Simplify right side
    371.36x = 121,282.48
  5. Step 5: Solve for x
    x = 121,282.48/371.36
  6. Step 6: Final answer
    x = 326.59

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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.