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Finding the Fourth Proportional to 126.64, 189.96 and 72.91

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Solution

The fourth proportional to 126.64, 189.96 and 72.91 is: 109.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.64 : 189.96 = 72.91 : x
  2. Step 2: Convert to fraction form
    126.64/189.96 = 72.91/x
  3. Step 3: Cross multiply
    126.64x = 189.96 × 72.91
  4. Step 4: Simplify right side
    126.64x = 13,849.98
  5. Step 5: Solve for x
    x = 13,849.98/126.64
  6. Step 6: Final answer
    x = 109.37

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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.