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Finding the Fourth Proportional to 126.00, 189.72 and 91.99

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Solution

The fourth proportional to 126.00, 189.72 and 91.99 is: 138.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.00 : 189.72 = 91.99 : x
  2. Step 2: Convert to fraction form
    126.00/189.72 = 91.99/x
  3. Step 3: Cross multiply
    126.00x = 189.72 × 91.99
  4. Step 4: Simplify right side
    126.00x = 17,451.88
  5. Step 5: Solve for x
    x = 17,451.88/126.00
  6. Step 6: Final answer
    x = 138.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.