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Finding the Fourth Proportional to 126.51, 189.79 and 90.36

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Solution

The fourth proportional to 126.51, 189.79 and 90.36 is: 135.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.51 : 189.79 = 90.36 : x
  2. Step 2: Convert to fraction form
    126.51/189.79 = 90.36/x
  3. Step 3: Cross multiply
    126.51x = 189.79 × 90.36
  4. Step 4: Simplify right side
    126.51x = 17,148.97
  5. Step 5: Solve for x
    x = 17,148.97/126.51
  6. Step 6: Final answer
    x = 135.56

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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.