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Finding the Fourth Proportional to 126.68, 190.08 and 72.62

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Solution

The fourth proportional to 126.68, 190.08 and 72.62 is: 108.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.68 : 190.08 = 72.62 : x
  2. Step 2: Convert to fraction form
    126.68/190.08 = 72.62/x
  3. Step 3: Cross multiply
    126.68x = 190.08 × 72.62
  4. Step 4: Simplify right side
    126.68x = 13,803.61
  5. Step 5: Solve for x
    x = 13,803.61/126.68
  6. Step 6: Final answer
    x = 108.96

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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.