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Finding the Fourth Proportional to 84.26, 125.60 and 79.70

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Solution

The fourth proportional to 84.26, 125.60 and 79.70 is: 118.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.26 : 125.60 = 79.70 : x
  2. Step 2: Convert to fraction form
    84.26/125.60 = 79.70/x
  3. Step 3: Cross multiply
    84.26x = 125.60 × 79.70
  4. Step 4: Simplify right side
    84.26x = 10,010.32
  5. Step 5: Solve for x
    x = 10,010.32/84.26
  6. Step 6: Final answer
    x = 118.80

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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.