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Finding the Fourth Proportional to 126.59, 189.90 and 106.25

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Solution

The fourth proportional to 126.59, 189.90 and 106.25 is: 159.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.59 : 189.90 = 106.25 : x
  2. Step 2: Convert to fraction form
    126.59/189.90 = 106.25/x
  3. Step 3: Cross multiply
    126.59x = 189.90 × 106.25
  4. Step 4: Simplify right side
    126.59x = 20,175.93
  5. Step 5: Solve for x
    x = 20,175.93/126.59
  6. Step 6: Final answer
    x = 159.39

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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.