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Finding the Fourth Proportional to 187.69, 281.63 and 91.50

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Solution

The fourth proportional to 187.69, 281.63 and 91.50 is: 137.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.69 : 281.63 = 91.50 : x
  2. Step 2: Convert to fraction form
    187.69/281.63 = 91.50/x
  3. Step 3: Cross multiply
    187.69x = 281.63 × 91.50
  4. Step 4: Simplify right side
    187.69x = 25,769.15
  5. Step 5: Solve for x
    x = 25,769.15/187.69
  6. Step 6: Final answer
    x = 137.30

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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.