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Finding the Fourth Proportional to 133.51, 199.89 and 87.76

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Solution

The fourth proportional to 133.51, 199.89 and 87.76 is: 131.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.51 : 199.89 = 87.76 : x
  2. Step 2: Convert to fraction form
    133.51/199.89 = 87.76/x
  3. Step 3: Cross multiply
    133.51x = 199.89 × 87.76
  4. Step 4: Simplify right side
    133.51x = 17,542.35
  5. Step 5: Solve for x
    x = 17,542.35/133.51
  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.