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Finding the Fourth Proportional to 187.91, 281.76 and 72.25

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Solution

The fourth proportional to 187.91, 281.76 and 72.25 is: 108.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.91 : 281.76 = 72.25 : x
  2. Step 2: Convert to fraction form
    187.91/281.76 = 72.25/x
  3. Step 3: Cross multiply
    187.91x = 281.76 × 72.25
  4. Step 4: Simplify right side
    187.91x = 20,357.16
  5. Step 5: Solve for x
    x = 20,357.16/187.91
  6. Step 6: Final answer
    x = 108.33

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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.