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Finding the Fourth Proportional to 98.35, 135.59 and 79.85

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Solution

The fourth proportional to 98.35, 135.59 and 79.85 is: 110.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.35 : 135.59 = 79.85 : x
  2. Step 2: Convert to fraction form
    98.35/135.59 = 79.85/x
  3. Step 3: Cross multiply
    98.35x = 135.59 × 79.85
  4. Step 4: Simplify right side
    98.35x = 10,826.80
  5. Step 5: Solve for x
    x = 10,826.80/98.35
  6. Step 6: Final answer
    x = 110.09

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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.