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Finding the Fourth Proportional to 80.13, 120.81 and 74.46

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Solution

The fourth proportional to 80.13, 120.81 and 74.46 is: 112.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.13 : 120.81 = 74.46 : x
  2. Step 2: Convert to fraction form
    80.13/120.81 = 74.46/x
  3. Step 3: Cross multiply
    80.13x = 120.81 × 74.46
  4. Step 4: Simplify right side
    80.13x = 8,995.51
  5. Step 5: Solve for x
    x = 8,995.51/80.13
  6. Step 6: Final answer
    x = 112.26

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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.