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Finding the Fourth Proportional to 126.96, 190.23 and 72.01

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Solution

The fourth proportional to 126.96, 190.23 and 72.01 is: 107.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.96 : 190.23 = 72.01 : x
  2. Step 2: Convert to fraction form
    126.96/190.23 = 72.01/x
  3. Step 3: Cross multiply
    126.96x = 190.23 × 72.01
  4. Step 4: Simplify right side
    126.96x = 13,698.46
  5. Step 5: Solve for x
    x = 13,698.46/126.96
  6. Step 6: Final answer
    x = 107.90

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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.