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Finding the Fourth Proportional to 126.79, 189.88 and 72.45

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Solution

The fourth proportional to 126.79, 189.88 and 72.45 is: 108.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.79 : 189.88 = 72.45 : x
  2. Step 2: Convert to fraction form
    126.79/189.88 = 72.45/x
  3. Step 3: Cross multiply
    126.79x = 189.88 × 72.45
  4. Step 4: Simplify right side
    126.79x = 13,756.62
  5. Step 5: Solve for x
    x = 13,756.62/126.79
  6. Step 6: Final answer
    x = 108.50

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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.