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Finding the Fourth Proportional to 217.61, 299.98 and 143.80

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Solution

The fourth proportional to 217.61, 299.98 and 143.80 is: 198.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.61 : 299.98 = 143.80 : x
  2. Step 2: Convert to fraction form
    217.61/299.98 = 143.80/x
  3. Step 3: Cross multiply
    217.61x = 299.98 × 143.80
  4. Step 4: Simplify right side
    217.61x = 43,137.68
  5. Step 5: Solve for x
    x = 43,137.68/217.61
  6. Step 6: Final answer
    x = 198.23

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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.