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Finding the Fourth Proportional to 114.96, 172.16 and 80.64

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Solution

The fourth proportional to 114.96, 172.16 and 80.64 is: 120.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.96 : 172.16 = 80.64 : x
  2. Step 2: Convert to fraction form
    114.96/172.16 = 80.64/x
  3. Step 3: Cross multiply
    114.96x = 172.16 × 80.64
  4. Step 4: Simplify right side
    114.96x = 13,882.98
  5. Step 5: Solve for x
    x = 13,882.98/114.96
  6. Step 6: Final answer
    x = 120.76

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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.