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Finding the Fourth Proportional to 217.60, 326.40 and 89.28

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Solution

The fourth proportional to 217.60, 326.40 and 89.28 is: 133.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.60 : 326.40 = 89.28 : x
  2. Step 2: Convert to fraction form
    217.60/326.40 = 89.28/x
  3. Step 3: Cross multiply
    217.60x = 326.40 × 89.28
  4. Step 4: Simplify right side
    217.60x = 29,140.99
  5. Step 5: Solve for x
    x = 29,140.99/217.60
  6. Step 6: Final answer
    x = 133.92

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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.