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Finding the Fourth Proportional to 126.72, 189.68 and 83.30

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Solution

The fourth proportional to 126.72, 189.68 and 83.30 is: 124.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.72 : 189.68 = 83.30 : x
  2. Step 2: Convert to fraction form
    126.72/189.68 = 83.30/x
  3. Step 3: Cross multiply
    126.72x = 189.68 × 83.30
  4. Step 4: Simplify right side
    126.72x = 15,798.98
  5. Step 5: Solve for x
    x = 15,798.98/126.72
  6. Step 6: Final answer
    x = 124.68

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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.