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Finding the Fourth Proportional to 133.23, 199.90 and 87.57

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Solution

The fourth proportional to 133.23, 199.90 and 87.57 is: 131.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.23 : 199.90 = 87.57 : x
  2. Step 2: Convert to fraction form
    133.23/199.90 = 87.57/x
  3. Step 3: Cross multiply
    133.23x = 199.90 × 87.57
  4. Step 4: Simplify right side
    133.23x = 17,504.31
  5. Step 5: Solve for x
    x = 17,504.31/133.23
  6. Step 6: Final answer
    x = 131.39

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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.