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Finding the Fourth Proportional to 218.84, 328.30 and 72.55

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Solution

The fourth proportional to 218.84, 328.30 and 72.55 is: 108.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.84 : 328.30 = 72.55 : x
  2. Step 2: Convert to fraction form
    218.84/328.30 = 72.55/x
  3. Step 3: Cross multiply
    218.84x = 328.30 × 72.55
  4. Step 4: Simplify right side
    218.84x = 23,817.16
  5. Step 5: Solve for x
    x = 23,817.16/218.84
  6. Step 6: Final answer
    x = 108.84

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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.