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Finding the Fourth Proportional to 84.65, 126.81 and 83.70

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Solution

The fourth proportional to 84.65, 126.81 and 83.70 is: 125.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.65 : 126.81 = 83.70 : x
  2. Step 2: Convert to fraction form
    84.65/126.81 = 83.70/x
  3. Step 3: Cross multiply
    84.65x = 126.81 × 83.70
  4. Step 4: Simplify right side
    84.65x = 10,614.00
  5. Step 5: Solve for x
    x = 10,614.00/84.65
  6. Step 6: Final answer
    x = 125.39

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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.