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Finding the Fourth Proportional to 217.21, 326.99 and 187.45

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Solution

The fourth proportional to 217.21, 326.99 and 187.45 is: 282.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.21 : 326.99 = 187.45 : x
  2. Step 2: Convert to fraction form
    217.21/326.99 = 187.45/x
  3. Step 3: Cross multiply
    217.21x = 326.99 × 187.45
  4. Step 4: Simplify right side
    217.21x = 61,294.28
  5. Step 5: Solve for x
    x = 61,294.28/217.21
  6. Step 6: Final answer
    x = 282.19

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.