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Finding the Fourth Proportional to 190.64, 263.12 and 125.20

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Solution

The fourth proportional to 190.64, 263.12 and 125.20 is: 172.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.64 : 263.12 = 125.20 : x
  2. Step 2: Convert to fraction form
    190.64/263.12 = 125.20/x
  3. Step 3: Cross multiply
    190.64x = 263.12 × 125.20
  4. Step 4: Simplify right side
    190.64x = 32,942.62
  5. Step 5: Solve for x
    x = 32,942.62/190.64
  6. Step 6: Final answer
    x = 172.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.