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Finding the Fourth Proportional to 114.65, 172.07 and 80.56

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Solution

The fourth proportional to 114.65, 172.07 and 80.56 is: 120.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.65 : 172.07 = 80.56 : x
  2. Step 2: Convert to fraction form
    114.65/172.07 = 80.56/x
  3. Step 3: Cross multiply
    114.65x = 172.07 × 80.56
  4. Step 4: Simplify right side
    114.65x = 13,861.96
  5. Step 5: Solve for x
    x = 13,861.96/114.65
  6. Step 6: Final answer
    x = 120.91

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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.