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Finding the Fourth Proportional to 187.89, 281.43 and 91.50

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Solution

The fourth proportional to 187.89, 281.43 and 91.50 is: 137.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.89 : 281.43 = 91.50 : x
  2. Step 2: Convert to fraction form
    187.89/281.43 = 91.50/x
  3. Step 3: Cross multiply
    187.89x = 281.43 × 91.50
  4. Step 4: Simplify right side
    187.89x = 25,750.85
  5. Step 5: Solve for x
    x = 25,750.85/187.89
  6. Step 6: Final answer
    x = 137.05

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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.