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Finding the Fourth Proportional to 218.80, 328.24 and 72.59

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Solution

The fourth proportional to 218.80, 328.24 and 72.59 is: 108.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.80 : 328.24 = 72.59 : x
  2. Step 2: Convert to fraction form
    218.80/328.24 = 72.59/x
  3. Step 3: Cross multiply
    218.80x = 328.24 × 72.59
  4. Step 4: Simplify right side
    218.80x = 23,826.94
  5. Step 5: Solve for x
    x = 23,826.94/218.80
  6. Step 6: Final answer
    x = 108.90

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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.