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Finding the Fourth Proportional to 187.75, 281.59 and 72.20

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Solution

The fourth proportional to 187.75, 281.59 and 72.20 is: 108.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.75 : 281.59 = 72.20 : x
  2. Step 2: Convert to fraction form
    187.75/281.59 = 72.20/x
  3. Step 3: Cross multiply
    187.75x = 281.59 × 72.20
  4. Step 4: Simplify right side
    187.75x = 20,329.39
  5. Step 5: Solve for x
    x = 20,329.39/187.75
  6. Step 6: Final answer
    x = 108.28

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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.