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Finding the Fourth Proportional to 218.98, 328.53 and 72.75

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Solution

The fourth proportional to 218.98, 328.53 and 72.75 is: 109.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.98 : 328.53 = 72.75 : x
  2. Step 2: Convert to fraction form
    218.98/328.53 = 72.75/x
  3. Step 3: Cross multiply
    218.98x = 328.53 × 72.75
  4. Step 4: Simplify right side
    218.98x = 23,901.09
  5. Step 5: Solve for x
    x = 23,901.09/218.98
  6. Step 6: Final answer
    x = 109.15

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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.