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Finding the Fourth Proportional to 126.62, 189.78 and 83.40

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Solution

The fourth proportional to 126.62, 189.78 and 83.40 is: 125.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.62 : 189.78 = 83.40 : x
  2. Step 2: Convert to fraction form
    126.62/189.78 = 83.40/x
  3. Step 3: Cross multiply
    126.62x = 189.78 × 83.40
  4. Step 4: Simplify right side
    126.62x = 15,827.65
  5. Step 5: Solve for x
    x = 15,827.65/126.62
  6. Step 6: Final answer
    x = 125.00

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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.