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Finding the Fourth Proportional to 217.90, 326.85 and 55.58

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Solution

The fourth proportional to 217.90, 326.85 and 55.58 is: 83.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.90 : 326.85 = 55.58 : x
  2. Step 2: Convert to fraction form
    217.90/326.85 = 55.58/x
  3. Step 3: Cross multiply
    217.90x = 326.85 × 55.58
  4. Step 4: Simplify right side
    217.90x = 18,166.32
  5. Step 5: Solve for x
    x = 18,166.32/217.90
  6. Step 6: Final answer
    x = 83.37

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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.