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Finding the Fourth Proportional to 80.36, 121.13 and 73.16

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Solution

The fourth proportional to 80.36, 121.13 and 73.16 is: 110.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.36 : 121.13 = 73.16 : x
  2. Step 2: Convert to fraction form
    80.36/121.13 = 73.16/x
  3. Step 3: Cross multiply
    80.36x = 121.13 × 73.16
  4. Step 4: Simplify right side
    80.36x = 8,861.87
  5. Step 5: Solve for x
    x = 8,861.87/80.36
  6. Step 6: Final answer
    x = 110.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.