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Finding the Fourth Proportional to 187.70, 281.66 and 99.86

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Solution

The fourth proportional to 187.70, 281.66 and 99.86 is: 149.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.70 : 281.66 = 99.86 : x
  2. Step 2: Convert to fraction form
    187.70/281.66 = 99.86/x
  3. Step 3: Cross multiply
    187.70x = 281.66 × 99.86
  4. Step 4: Simplify right side
    187.70x = 28,126.57
  5. Step 5: Solve for x
    x = 28,126.57/187.70
  6. Step 6: Final answer
    x = 149.85

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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.