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Finding the Fourth Proportional to 120.94, 181.36 and 72.16

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Solution

The fourth proportional to 120.94, 181.36 and 72.16 is: 108.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.94 : 181.36 = 72.16 : x
  2. Step 2: Convert to fraction form
    120.94/181.36 = 72.16/x
  3. Step 3: Cross multiply
    120.94x = 181.36 × 72.16
  4. Step 4: Simplify right side
    120.94x = 13,086.94
  5. Step 5: Solve for x
    x = 13,086.94/120.94
  6. Step 6: Final answer
    x = 108.21

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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.