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Finding the Fourth Proportional to 133.50, 199.87 and 87.71

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Solution

The fourth proportional to 133.50, 199.87 and 87.71 is: 131.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.50 : 199.87 = 87.71 : x
  2. Step 2: Convert to fraction form
    133.50/199.87 = 87.71/x
  3. Step 3: Cross multiply
    133.50x = 199.87 × 87.71
  4. Step 4: Simplify right side
    133.50x = 17,529.94
  5. Step 5: Solve for x
    x = 17,529.94/133.50
  6. Step 6: Final answer
    x = 131.31

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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.