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Finding the Fourth Proportional to 217.51, 326.30 and 73.18

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Solution

The fourth proportional to 217.51, 326.30 and 73.18 is: 109.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.51 : 326.30 = 73.18 : x
  2. Step 2: Convert to fraction form
    217.51/326.30 = 73.18/x
  3. Step 3: Cross multiply
    217.51x = 326.30 × 73.18
  4. Step 4: Simplify right side
    217.51x = 23,878.63
  5. Step 5: Solve for x
    x = 23,878.63/217.51
  6. Step 6: Final answer
    x = 109.78

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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.