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Finding the Fourth Proportional to 217.55, 299.32 and 189.99

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Solution

The fourth proportional to 217.55, 299.32 and 189.99 is: 261.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.55 : 299.32 = 189.99 : x
  2. Step 2: Convert to fraction form
    217.55/299.32 = 189.99/x
  3. Step 3: Cross multiply
    217.55x = 299.32 × 189.99
  4. Step 4: Simplify right side
    217.55x = 56,867.02
  5. Step 5: Solve for x
    x = 56,867.02/217.55
  6. Step 6: Final answer
    x = 261.39

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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.