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Finding the Fourth Proportional to 84.69, 126.07 and 84.23

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Solution

The fourth proportional to 84.69, 126.07 and 84.23 is: 125.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.69 : 126.07 = 84.23 : x
  2. Step 2: Convert to fraction form
    84.69/126.07 = 84.23/x
  3. Step 3: Cross multiply
    84.69x = 126.07 × 84.23
  4. Step 4: Simplify right side
    84.69x = 10,618.45
  5. Step 5: Solve for x
    x = 10,618.45/84.69
  6. Step 6: Final answer
    x = 125.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.