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Finding the Fourth Proportional to 126.21, 189.13 and 71.99

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Solution

The fourth proportional to 126.21, 189.13 and 71.99 is: 107.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.21 : 189.13 = 71.99 : x
  2. Step 2: Convert to fraction form
    126.21/189.13 = 71.99/x
  3. Step 3: Cross multiply
    126.21x = 189.13 × 71.99
  4. Step 4: Simplify right side
    126.21x = 13,615.47
  5. Step 5: Solve for x
    x = 13,615.47/126.21
  6. Step 6: Final answer
    x = 107.88

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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.