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Finding the Fourth Proportional to 115.85, 173.88 and 81.51

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Solution

The fourth proportional to 115.85, 173.88 and 81.51 is: 122.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.85 : 173.88 = 81.51 : x
  2. Step 2: Convert to fraction form
    115.85/173.88 = 81.51/x
  3. Step 3: Cross multiply
    115.85x = 173.88 × 81.51
  4. Step 4: Simplify right side
    115.85x = 14,172.96
  5. Step 5: Solve for x
    x = 14,172.96/115.85
  6. Step 6: Final answer
    x = 122.34

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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.