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Finding the Fourth Proportional to 126.20, 174.23 and 84.89

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Solution

The fourth proportional to 126.20, 174.23 and 84.89 is: 117.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.20 : 174.23 = 84.89 : x
  2. Step 2: Convert to fraction form
    126.20/174.23 = 84.89/x
  3. Step 3: Cross multiply
    126.20x = 174.23 × 84.89
  4. Step 4: Simplify right side
    126.20x = 14,790.38
  5. Step 5: Solve for x
    x = 14,790.38/126.20
  6. Step 6: Final answer
    x = 117.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.