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Finding the Fourth Proportional to 84.70, 126.78 and 44.07

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Solution

The fourth proportional to 84.70, 126.78 and 44.07 is: 65.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.70 : 126.78 = 44.07 : x
  2. Step 2: Convert to fraction form
    84.70/126.78 = 44.07/x
  3. Step 3: Cross multiply
    84.70x = 126.78 × 44.07
  4. Step 4: Simplify right side
    84.70x = 5,586.56
  5. Step 5: Solve for x
    x = 5,586.56/84.70
  6. Step 6: Final answer
    x = 65.96

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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.