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Finding the Fourth Proportional to 133.15, 199.72 and 87.36

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Solution

The fourth proportional to 133.15, 199.72 and 87.36 is: 131.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.15 : 199.72 = 87.36 : x
  2. Step 2: Convert to fraction form
    133.15/199.72 = 87.36/x
  3. Step 3: Cross multiply
    133.15x = 199.72 × 87.36
  4. Step 4: Simplify right side
    133.15x = 17,447.54
  5. Step 5: Solve for x
    x = 17,447.54/133.15
  6. Step 6: Final answer
    x = 131.04

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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.