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Finding the Fourth Proportional to 105.06, 157.16 and 80.76

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Solution

The fourth proportional to 105.06, 157.16 and 80.76 is: 120.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.06 : 157.16 = 80.76 : x
  2. Step 2: Convert to fraction form
    105.06/157.16 = 80.76/x
  3. Step 3: Cross multiply
    105.06x = 157.16 × 80.76
  4. Step 4: Simplify right side
    105.06x = 12,692.24
  5. Step 5: Solve for x
    x = 12,692.24/105.06
  6. Step 6: Final answer
    x = 120.81

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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.