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Finding the Fourth Proportional to 187.55, 281.09 and 65.74

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Solution

The fourth proportional to 187.55, 281.09 and 65.74 is: 98.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.55 : 281.09 = 65.74 : x
  2. Step 2: Convert to fraction form
    187.55/281.09 = 65.74/x
  3. Step 3: Cross multiply
    187.55x = 281.09 × 65.74
  4. Step 4: Simplify right side
    187.55x = 18,478.86
  5. Step 5: Solve for x
    x = 18,478.86/187.55
  6. Step 6: Final answer
    x = 98.53

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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.