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Finding the Fourth Proportional to 282.88, 389.91 and 217.41

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Solution

The fourth proportional to 282.88, 389.91 and 217.41 is: 299.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.88 : 389.91 = 217.41 : x
  2. Step 2: Convert to fraction form
    282.88/389.91 = 217.41/x
  3. Step 3: Cross multiply
    282.88x = 389.91 × 217.41
  4. Step 4: Simplify right side
    282.88x = 84,768.38
  5. Step 5: Solve for x
    x = 84,768.38/282.88
  6. Step 6: Final answer
    x = 299.66

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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.