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Finding the Fourth Proportional to 89.15, 133.72 and 87.80

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Solution

The fourth proportional to 89.15, 133.72 and 87.80 is: 131.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.15 : 133.72 = 87.80 : x
  2. Step 2: Convert to fraction form
    89.15/133.72 = 87.80/x
  3. Step 3: Cross multiply
    89.15x = 133.72 × 87.80
  4. Step 4: Simplify right side
    89.15x = 11,739.73
  5. Step 5: Solve for x
    x = 11,739.73/89.15
  6. Step 6: Final answer
    x = 131.69

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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.